diff --git a/Makefile b/Makefile
index c9e98d9..eaeb75d 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ hexgrammar:
 	flexgo -G -v -o hex/hex_lexer.go hex/hex_lexer.l && goyacc -p hex -o hex/hex_parser.go hex/hex_grammar.y
 
 proto:
-	protoc --go_out=. pb/yara.proto
+	protoc --go_out=. --go_opt=paths=source_relative pb/yara.proto
 
 j2y:
 	go build github.com/VirusTotal/gyp/cmd/j2y
diff --git a/ast/ast.go b/ast/ast.go
index 76b4272..d33f126 100644
--- a/ast/ast.go
+++ b/ast/ast.go
@@ -176,6 +176,12 @@ type Quantifier struct {
 	Expression
 }
 
+// Percentage is an Expression used in evaluating string sets. Example:
+//   <expression>% of <string set>
+type Percentage struct {
+	Expression
+}
+
 // ForIn is an Expression representing a "for in" loop. Example:
 //   for <quantifier> <variables> in <iterator> : ( <condition> )
 type ForIn struct {
@@ -499,6 +505,15 @@ func (o *Of) WriteSource(w io.Writer) error {
 	return err
 }
 
+// WriteSource writes the node's source into the writer w.
+func (p *Percentage) WriteSource(w io.Writer) error {
+	err := p.Expression.WriteSource(w)
+	if err == nil {
+		_, err = io.WriteString(w, "%")
+	}
+	return err
+}
+
 // WriteSource writes the operation into the writer w.
 func (o *Operation) WriteSource(w io.Writer) error {
 	if len(o.Operands) < 2 {
@@ -892,26 +907,44 @@ func (s *Subscripting) AsProto() *pb.Expression {
 	}
 }
 
+// AsProto returns the Expression serialized as a pb.Expression.
+func (p *Percentage) AsProto() *pb.Expression {
+	return &pb.Expression{
+		Expression: &pb.Expression_PercentageExpression{
+			PercentageExpression: &pb.Percentage{
+				Expression: p.Expression.AsProto(),
+			},
+		},
+	}
+}
+
 // AsProto returns the Expression serialized as a pb.Expression.
 func (q *Quantifier) AsProto() *pb.ForExpression {
 	var expr *pb.ForExpression
-	if kw, isKeyword := q.Expression.(Keyword); isKeyword {
+	switch v := q.Expression.(type) {
+	case *Percentage:
+		expr = &pb.ForExpression{
+			For: &pb.ForExpression_Expression{
+				Expression: v.AsProto(),
+			},
+		}
+	case Keyword:
 		var pbkw pb.ForKeyword
-		if kw == KeywordAll {
+		if v == KeywordAll {
 			pbkw = pb.ForKeyword_ALL
-		} else if kw == KeywordAny {
+		} else if v == KeywordAny {
 			pbkw = pb.ForKeyword_ANY
-		} else if kw == KeywordNone {
+		} else if v == KeywordNone {
 			pbkw = pb.ForKeyword_NONE
 		} else {
-			panic(fmt.Sprintf("unexpected keyword in for: %s", kw))
+			panic(fmt.Sprintf("unexpected keyword in for: %s", v))
 		}
 		expr = &pb.ForExpression{
 			For: &pb.ForExpression_Keyword{
 				Keyword: pbkw,
 			},
 		}
-	} else {
+	default:
 		expr = &pb.ForExpression{
 			For: &pb.ForExpression_Expression{
 				Expression: q.Expression.AsProto(),
diff --git a/ast/serialization.go b/ast/serialization.go
index b26af62..ad41ad3 100644
--- a/ast/serialization.go
+++ b/ast/serialization.go
@@ -488,6 +488,10 @@ func expressionFromProto(e *pb.Expression) Expression {
 		default:
 			panic(fmt.Sprintf(`unknown keyword "%T"`, keyword))
 		}
+	case *pb.Expression_PercentageExpression:
+		return &Percentage{
+			Expression: expressionFromProto(v.PercentageExpression.Expression),
+		}
 	default:
 		panic(fmt.Sprintf(`unexpected node "%T"`, v))
 	}
diff --git a/parser/grammar.y b/parser/grammar.y
index f8eacf5..539fe28 100644
--- a/parser/grammar.y
+++ b/parser/grammar.y
@@ -157,6 +157,7 @@ type stringModifiers struct {
 %type <exprs>     arguments_list
 %type <exprs>     arguments
 %type <quantifier> for_expression
+%type <percentage> percent_expression
 %type <exprs>     integer_enumeration
 %type <node>      iterator
 %type <node>      integer_set
@@ -190,6 +191,7 @@ type stringModifiers struct {
     si            *ast.StringIdentifier
     sis           []*ast.StringIdentifier
     quantifier    *ast.Quantifier
+    percentage    *ast.Percentage
 
     // lineno is not a symbol type, it's the line number where the symbol
     // appears in the source file. This is a little hack used for passing
@@ -824,6 +826,13 @@ expression
           Strings: $3,
         }
       }
+    | percent_expression _OF_ string_set
+      {
+        $$ = &ast.Of{
+          Quantifier: &ast.Quantifier{$1},
+          Strings: $3,
+        }
+      }
     | _NOT_ boolean_expression
       {
         $$ = &ast.Not{$2}
@@ -964,6 +973,14 @@ string_enumeration_item
     ;
 
 
+percent_expression
+    : primary_expression '%'
+      {
+        $$ = &ast.Percentage{$1}
+      }
+    ;
+
+
 for_expression
     : primary_expression
       {
diff --git a/parser/parser.go b/parser/parser.go
index 4cc1e63..e9dfb57 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -35,7 +35,7 @@ type stringModifiers struct {
 	Base64Alphabet string
 }
 
-//line parser/grammar.y:171
+//line parser/grammar.y:172
 type yrSymType struct {
 	yys        int
 	i64        int64
@@ -59,6 +59,7 @@ type yrSymType struct {
 	si         *ast.StringIdentifier
 	sis        []*ast.StringIdentifier
 	quantifier *ast.Quantifier
+	percentage *ast.Percentage
 
 	// lineno is not a symbol type, it's the line number where the symbol
 	// appears in the source file. This is a little hack used for passing
@@ -233,7 +234,7 @@ const yrEofCode = 1
 const yrErrCode = 2
 const yrInitialStackSize = 16
 
-//line parser/grammar.y:1137
+//line parser/grammar.y:1154
 
 // This function takes an operator and two operands and returns a Expression
 // representing the operation. If the left operand is an operation of the
@@ -259,16 +260,16 @@ var yrExca = [...]int{
 	1, -1,
 	-2, 15,
 	-1, 52,
-	38, 108,
-	-2, 95,
-	-1, 113,
-	38, 108,
-	-2, 95,
-	-1, 171,
+	38, 110,
+	-2, 96,
+	-1, 115,
+	38, 110,
+	-2, 96,
+	-1, 175,
 	78, 66,
 	82, 66,
 	-2, 69,
-	-1, 214,
+	-1, 218,
 	78, 67,
 	82, 67,
 	-2, 69,
@@ -276,108 +277,107 @@ var yrExca = [...]int{
 
 const yrPrivate = 57344
 
-const yrLast = 457
+const yrLast = 431
 
 var yrAct = [...]int{
-	52, 186, 49, 152, 67, 159, 229, 212, 182, 194,
-	230, 213, 117, 116, 82, 83, 84, 85, 86, 87,
-	88, 120, 161, 118, 119, 241, 114, 102, 100, 101,
-	93, 94, 89, 91, 90, 92, 103, 104, 95, 96,
-	97, 98, 99, 233, 235, 81, 80, 232, 70, 81,
-	80, 163, 193, 183, 74, 108, 234, 162, 113, 160,
-	112, 228, 222, 217, 216, 215, 153, 48, 115, 121,
-	122, 240, 42, 39, 38, 238, 219, 211, 40, 28,
-	26, 17, 18, 111, 129, 130, 131, 132, 133, 134,
-	135, 136, 137, 138, 139, 140, 141, 142, 143, 144,
-	145, 146, 147, 148, 149, 150, 151, 126, 127, 80,
-	158, 95, 96, 97, 98, 99, 164, 165, 166, 208,
-	168, 110, 55, 171, 81, 80, 74, 53, 64, 65,
-	66, 128, 61, 62, 60, 63, 75, 75, 103, 104,
-	95, 96, 97, 98, 99, 5, 58, 59, 71, 72,
-	73, 225, 30, 54, 181, 224, 102, 100, 101, 97,
-	98, 99, 184, 50, 51, 103, 104, 95, 96, 97,
-	98, 99, 76, 78, 77, 105, 44, 107, 35, 43,
-	68, 106, 37, 192, 56, 69, 209, 206, 13, 7,
-	154, 57, 4, 8, 239, 187, 226, 214, 79, 188,
-	157, 33, 36, 210, 167, 218, 31, 46, 47, 221,
-	23, 20, 14, 41, 74, 223, 64, 65, 66, 25,
-	61, 62, 60, 63, 45, 75, 156, 9, 11, 12,
-	180, 237, 100, 101, 58, 59, 71, 72, 73, 22,
-	103, 104, 95, 96, 97, 98, 99, 123, 27, 231,
-	102, 100, 101, 15, 1, 236, 185, 155, 207, 103,
-	104, 95, 96, 97, 98, 99, 205, 220, 68, 169,
-	170, 32, 6, 69, 102, 100, 101, 191, 10, 109,
-	125, 179, 124, 103, 104, 95, 96, 97, 98, 99,
-	82, 83, 84, 85, 86, 87, 88, 173, 172, 195,
-	34, 190, 24, 102, 100, 101, 93, 94, 89, 91,
-	90, 92, 103, 104, 95, 96, 97, 98, 99, 74,
-	21, 64, 65, 66, 29, 61, 62, 60, 63, 19,
-	75, 16, 102, 100, 101, 2, 3, 0, 0, 58,
-	59, 103, 104, 95, 96, 97, 98, 99, 102, 100,
-	101, 204, 0, 0, 0, 0, 227, 103, 104, 95,
-	96, 97, 98, 99, 0, 178, 0, 0, 0, 0,
-	0, 0, 189, 68, 0, 0, 0, 0, 69, 102,
-	100, 101, 175, 174, 109, 176, 177, 0, 103, 104,
-	95, 96, 97, 98, 99, 0, 0, 0, 0, 0,
-	102, 100, 101, 163, 0, 0, 0, 0, 0, 103,
-	104, 95, 96, 97, 98, 99, 102, 100, 101, 0,
-	0, 0, 0, 0, 0, 103, 104, 95, 96, 97,
-	98, 99, 101, 200, 0, 0, 0, 0, 0, 103,
-	104, 95, 96, 97, 98, 99, 0, 0, 0, 0,
-	197, 196, 203, 198, 199, 201, 202,
+	52, 190, 49, 154, 68, 233, 216, 186, 162, 234,
+	217, 198, 119, 118, 83, 84, 85, 86, 87, 88,
+	89, 122, 232, 120, 121, 245, 116, 103, 101, 102,
+	94, 95, 90, 92, 91, 93, 104, 105, 97, 98,
+	99, 100, 96, 82, 81, 239, 82, 81, 71, 237,
+	236, 167, 187, 197, 166, 109, 42, 238, 75, 115,
+	226, 114, 221, 220, 103, 101, 102, 48, 38, 244,
+	123, 124, 242, 104, 105, 97, 98, 99, 100, 160,
+	164, 219, 155, 117, 113, 131, 132, 133, 134, 135,
+	136, 137, 138, 139, 140, 141, 142, 143, 144, 145,
+	146, 147, 148, 149, 150, 151, 152, 153, 128, 129,
+	223, 161, 215, 40, 28, 18, 26, 163, 168, 169,
+	170, 165, 172, 212, 17, 175, 39, 75, 53, 65,
+	66, 67, 130, 62, 63, 61, 64, 81, 76, 104,
+	105, 97, 98, 99, 100, 160, 112, 59, 60, 72,
+	73, 74, 82, 81, 54, 55, 185, 99, 100, 160,
+	111, 143, 101, 102, 50, 51, 76, 188, 229, 228,
+	104, 105, 97, 98, 99, 100, 160, 13, 156, 8,
+	44, 69, 243, 43, 230, 57, 70, 5, 159, 80,
+	213, 210, 58, 103, 101, 102, 97, 98, 99, 100,
+	160, 218, 104, 105, 97, 98, 99, 100, 160, 222,
+	108, 46, 47, 225, 158, 35, 36, 231, 75, 227,
+	65, 66, 67, 214, 62, 63, 61, 64, 45, 76,
+	30, 7, 25, 171, 4, 241, 102, 31, 59, 60,
+	72, 73, 74, 104, 105, 97, 98, 99, 100, 160,
+	41, 106, 23, 235, 103, 101, 102, 107, 191, 240,
+	37, 20, 192, 104, 105, 97, 98, 99, 100, 160,
+	14, 33, 69, 77, 79, 78, 22, 70, 103, 101,
+	102, 196, 184, 110, 9, 11, 12, 104, 105, 97,
+	98, 99, 100, 160, 125, 27, 15, 103, 101, 102,
+	1, 189, 157, 211, 209, 195, 104, 105, 97, 98,
+	99, 100, 160, 83, 84, 85, 86, 87, 88, 89,
+	224, 56, 173, 174, 194, 32, 103, 101, 102, 94,
+	95, 90, 92, 91, 93, 104, 105, 97, 98, 99,
+	100, 96, 75, 6, 65, 66, 67, 10, 62, 63,
+	61, 64, 127, 76, 208, 103, 101, 102, 183, 126,
+	177, 176, 59, 60, 104, 105, 97, 98, 99, 100,
+	160, 103, 101, 102, 199, 34, 24, 21, 29, 193,
+	104, 105, 97, 98, 99, 100, 160, 19, 16, 2,
+	3, 0, 0, 0, 0, 167, 69, 0, 0, 0,
+	0, 70, 204, 103, 101, 102, 0, 110, 0, 182,
+	0, 0, 104, 105, 97, 98, 99, 100, 160, 201,
+	200, 207, 202, 203, 205, 206, 179, 178, 0, 180,
+	181,
 }
 
 var yrPact = [...]int{
-	-1000, 141, -1000, -1000, 172, -1000, 221, 167, -1000, 200,
-	-1000, -1000, -1000, -1000, -1000, 6, 9, 199, 230, 198,
-	-1000, 209, 5, -1000, -1000, 4, 194, 190, 189, 194,
-	-1000, -2, -1, 3, 189, -1000, -4, -1000, 158, -1000,
-	114, -1000, 151, -1000, -1000, 180, -1000, -1000, 72, -1000,
-	-1000, -1000, 249, 144, 202, 83, 114, 114, -1000, -1000,
-	-9, -1000, -1000, -1000, -1000, -67, -68, -56, 307, 307,
-	-1000, -1000, -1000, -1000, -1000, -1000, -1000, -1000, -1000, -1000,
-	114, 114, 113, 307, 307, 307, 307, 307, 307, 307,
-	307, 307, 307, 307, 307, 307, 307, 307, 307, 307,
-	307, 307, 307, 307, 307, 307, -11, 188, 362, 307,
-	-18, -1000, -21, -27, 72, 307, 307, 307, 192, 307,
-	114, -1000, -1000, -1000, 358, 223, -1000, 56, -1000, 362,
-	362, 362, 362, 362, 362, 362, 362, 362, 362, 362,
-	362, 92, 92, -1000, -1000, -1000, 376, 75, 177, 46,
-	46, 362, -1000, 307, -1000, -29, -18, -1000, 325, -1000,
-	182, -1000, -1000, -1000, 294, 220, 196, -1000, 102, -26,
-	-73, -1000, 426, -1000, -1000, -1000, -1000, -1000, -1000, -1000,
-	-1000, 346, 42, 191, 2, -71, -1000, -1000, -1000, -1000,
-	-1000, -1000, -1000, -1000, 114, -1000, -1000, -1000, -1000, -1000,
-	-1000, -12, -13, -14, 307, 1, -56, -1000, 307, -1000,
-	-1000, -15, -1000, 182, -1000, 134, 130, 178, 278, -16,
-	-72, 346, 114, -1000, -31, -35, -22, -1000, 114, -1000,
-	307, -3, -1000, -1000, -1000, 176, -7, 362, -1000, -53,
-	-1000, -1000,
+	-1000, 183, -1000, -1000, 158, -1000, 278, 156, -1000, 258,
+	-1000, -1000, -1000, -1000, -1000, 49, 42, 249, 267, 240,
+	-1000, 222, 41, -1000, -1000, 39, 225, 260, 203, 225,
+	-1000, -8, 52, 38, 203, -1000, -20, -1000, 162, -1000,
+	115, -1000, 252, -1000, -1000, 171, -1000, -1000, 100, -1000,
+	-1000, -1000, 272, 220, 206, 122, 108, 115, 115, -1000,
+	-1000, 6, -1000, -1000, -1000, -1000, -67, -68, -56, 330,
+	330, -1000, -1000, -1000, -1000, -1000, -1000, -1000, -1000, -1000,
+	-1000, 115, 115, 143, 330, 330, 330, 330, 330, 330,
+	330, 330, 330, 330, 330, 330, 330, 330, 330, 330,
+	330, 330, 330, 330, 330, 330, 330, 5, 176, 10,
+	330, 40, 40, -1000, -24, -27, 100, 330, 330, 330,
+	221, 330, 115, -1000, -1000, -1000, 402, 275, -1000, 84,
+	-1000, 10, 10, 10, 10, 10, 10, 10, 10, 10,
+	10, 10, 10, -1000, 90, 90, -1000, -1000, 180, 76,
+	107, 131, 131, 10, -1000, 330, -1000, -30, 40, -1000,
+	330, 317, -1000, 245, -1000, -1000, -1000, -1000, 301, 243,
+	224, -1000, 200, -25, -71, -1000, 395, -1000, -1000, -1000,
+	-1000, -1000, -1000, -1000, -1000, 349, 46, 211, 37, -72,
+	-1000, -1000, -1000, -1000, -1000, -1000, -1000, -1000, 115, -1000,
+	-1000, -1000, -1000, -1000, -1000, 4, -14, -15, 330, 35,
+	-56, -1000, 330, -1000, -1000, -17, -1000, 245, -1000, 148,
+	147, 166, 139, -55, -73, 349, 115, -1000, -28, -29,
+	-21, -1000, 115, -1000, 330, -6, -1000, -1000, -1000, 164,
+	-9, 10, -1000, -53, -1000, -1000,
 }
 
 var yrPgo = [...]int{
-	0, 336, 335, 331, 329, 152, 324, 320, 302, 178,
-	300, 299, 298, 297, 282, 281, 280, 278, 272, 271,
-	2, 26, 0, 4, 270, 269, 122, 267, 266, 258,
-	5, 48, 3, 257, 256, 1, 254, 253, 248, 247,
+	0, 390, 389, 388, 387, 230, 378, 377, 376, 215,
+	375, 374, 361, 360, 359, 358, 352, 347, 343, 325,
+	2, 26, 0, 4, 323, 322, 155, 321, 320, 304,
+	303, 8, 48, 3, 302, 301, 1, 300, 296, 295,
+	294,
 }
 
 var yrR1 = [...]int{
-	0, 36, 36, 36, 36, 36, 1, 37, 38, 2,
+	0, 37, 37, 37, 37, 37, 1, 38, 39, 2,
 	7, 7, 8, 8, 19, 18, 18, 17, 17, 3,
 	3, 4, 4, 6, 6, 5, 5, 5, 5, 5,
-	10, 10, 39, 9, 9, 9, 12, 12, 11, 11,
+	10, 10, 40, 9, 9, 9, 12, 12, 11, 11,
 	11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
 	14, 14, 13, 13, 13, 13, 13, 16, 16, 15,
-	23, 23, 23, 23, 25, 25, 24, 24, 31, 21,
+	23, 23, 23, 23, 25, 25, 24, 24, 32, 21,
 	20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
 	20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
-	20, 20, 20, 20, 20, 20, 20, 29, 29, 32,
-	27, 27, 30, 30, 34, 34, 35, 35, 26, 26,
-	26, 26, 33, 33, 28, 28, 22, 22, 22, 22,
+	20, 20, 20, 20, 20, 20, 20, 20, 30, 30,
+	33, 28, 28, 31, 31, 35, 35, 36, 36, 27,
+	26, 26, 26, 26, 34, 34, 29, 29, 22, 22,
 	22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
 	22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
-	22, 22,
+	22, 22, 22, 22,
 }
 
 var yrR2 = [...]int{
@@ -389,41 +389,41 @@ var yrR2 = [...]int{
 	0, 2, 1, 1, 1, 1, 1, 0, 2, 1,
 	1, 3, 4, 4, 0, 1, 1, 3, 1, 1,
 	1, 1, 3, 3, 3, 3, 3, 3, 3, 1,
-	3, 3, 3, 9, 8, 3, 2, 3, 3, 3,
-	3, 3, 3, 3, 3, 1, 3, 3, 1, 5,
-	1, 3, 3, 1, 1, 3, 1, 1, 1, 1,
-	1, 1, 1, 3, 1, 1, 3, 1, 1, 4,
-	1, 1, 1, 1, 4, 1, 4, 1, 1, 2,
-	3, 3, 3, 3, 3, 3, 3, 3, 2, 3,
-	3, 1,
+	3, 3, 3, 9, 8, 3, 3, 2, 3, 3,
+	3, 3, 3, 3, 3, 3, 1, 3, 3, 1,
+	5, 1, 3, 3, 1, 1, 3, 1, 1, 2,
+	1, 1, 1, 1, 1, 3, 1, 1, 3, 1,
+	1, 4, 1, 1, 1, 1, 4, 1, 4, 1,
+	1, 2, 3, 3, 3, 3, 3, 3, 3, 3,
+	2, 3, 3, 1,
 }
 
 var yrChk = [...]int{
-	-1000, -36, -2, -1, 51, 4, -18, 48, 21, 6,
-	-17, 7, 8, 21, 12, -37, -3, 75, 73, -4,
-	12, -7, 9, 12, -8, 10, 75, -38, 75, -6,
+	-1000, -37, -2, -1, 51, 4, -18, 48, 21, 6,
+	-17, 7, 8, 21, 12, -38, -3, 75, 73, -4,
+	12, -7, 9, 12, -8, 10, 75, -39, 75, -6,
 	-5, 12, -19, 11, -10, -9, 13, -5, 76, 74,
 	75, -9, 76, 21, 18, 66, 49, 50, -21, -20,
-	49, 50, -22, 13, 39, -26, 70, 77, 32, 33,
-	20, 18, 19, 21, 14, 15, 16, -23, 66, 71,
-	-31, 34, 35, 36, 12, 23, 21, 23, 22, 18,
-	53, 52, 41, 42, 43, 44, 45, 46, 47, 59,
-	61, 60, 62, 57, 58, 65, 66, 67, 68, 69,
-	55, 56, 54, 63, 64, 31, 37, -26, -22, 77,
-	38, -21, -20, -22, -21, 77, 80, 80, 79, 80,
-	77, -22, -22, -39, -14, -16, -21, -21, -31, -22,
-	-22, -22, -22, -22, -22, -22, -22, -22, -22, -22,
+	49, 50, -22, 13, 39, -26, -27, 70, 77, 32,
+	33, 20, 18, 19, 21, 14, 15, 16, -23, 66,
+	71, -32, 34, 35, 36, 12, 23, 21, 23, 22,
+	18, 53, 52, 41, 42, 43, 44, 45, 46, 47,
+	59, 61, 60, 62, 57, 58, 69, 65, 66, 67,
+	68, 55, 56, 54, 63, 64, 31, 37, -26, -22,
+	77, 38, 38, -21, -20, -22, -21, 77, 80, 80,
+	79, 80, 77, -22, -22, -40, -14, -16, -21, -21,
+	-32, -22, -22, -22, -22, -22, -22, -22, -22, -22,
 	-22, -22, -22, -22, -22, -22, -22, -22, -22, -22,
-	-22, -22, -32, 77, 2, -33, 38, 12, -22, -30,
-	77, 40, 78, 78, -22, -22, -22, 12, -22, -25,
-	-24, -20, -12, -13, 25, 24, 27, 28, 7, -15,
-	7, -22, 37, 82, -30, -34, -35, 13, 17, 78,
-	81, 81, 81, 78, 82, -11, 25, 24, 27, 28,
-	7, 29, 30, 26, 5, -28, -23, -29, 77, -32,
-	12, 75, 78, 82, -20, 77, 77, 77, -22, 75,
-	-27, -22, 77, -35, 21, 21, 18, 78, 77, 78,
-	82, -21, 78, 78, 78, 66, -21, -22, 78, 18,
-	78, 78,
+	-22, -22, -22, -22, -33, 77, 2, -34, 38, 12,
+	69, -22, -31, 77, 40, -31, 78, 78, -22, -22,
+	-22, 12, -22, -25, -24, -20, -12, -13, 25, 24,
+	27, 28, 7, -15, 7, -22, 37, 82, -31, -35,
+	-36, 13, 17, 78, 81, 81, 81, 78, 82, -11,
+	25, 24, 27, 28, 7, 29, 30, 26, 5, -29,
+	-23, -30, 77, -33, 12, 75, 78, 82, -20, 77,
+	77, 77, -22, 75, -28, -22, 77, -36, 21, 21,
+	18, 78, 77, 78, 82, -21, 78, 78, 78, 66,
+	-21, -22, 78, 18, 78, 78,
 }
 
 var yrDef = [...]int{
@@ -432,26 +432,26 @@ var yrDef = [...]int{
 	21, 12, 0, 22, 8, 0, 0, 0, 0, 11,
 	23, 0, 0, 0, 13, 30, 0, 24, 0, 9,
 	0, 31, 0, 25, 26, 0, 28, 29, 14, 69,
-	70, 71, -2, 79, 0, 0, 0, 0, 117, 118,
-	0, 120, 121, 122, 123, 125, 127, 128, 0, 0,
-	141, 109, 110, 111, 60, 68, 32, 50, 57, 27,
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-	0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
-	0, 0, 0, 0, 0, 0, 0, 0, 108, 0,
-	0, 86, 69, -2, 0, 0, 0, 0, 0, 0,
-	64, 129, 138, 36, 34, 35, 87, 88, 72, 73,
-	74, 75, 76, 77, 78, 89, 90, 91, 92, 93,
-	94, 130, 131, 132, 133, 134, 135, 136, 137, 139,
-	140, 80, 81, 0, 82, 0, 0, 112, 0, 85,
-	0, 103, 96, 116, 0, 0, 0, 61, 0, 0,
-	65, -2, 33, 51, 52, 53, 54, 55, 56, 58,
-	59, 0, 0, 0, 0, 0, 104, 106, 107, 119,
-	124, 126, 62, 63, 0, 37, 38, 39, 40, 41,
-	42, 43, 44, 47, 0, 0, 114, 115, 0, 98,
-	113, 0, 102, 0, -2, 0, 0, 0, 0, 0,
-	0, 100, 0, 105, 0, 0, 0, 99, 0, 97,
-	0, 0, 45, 46, 48, 0, 0, 101, 84, 0,
-	83, 49,
+	70, 71, -2, 79, 0, 0, 0, 0, 0, 119,
+	120, 0, 122, 123, 124, 125, 127, 129, 130, 0,
+	0, 143, 111, 112, 113, 60, 68, 32, 50, 57,
+	27, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 109, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 110,
+	0, 0, 0, 87, 69, -2, 0, 0, 0, 0,
+	0, 0, 64, 131, 140, 36, 34, 35, 88, 89,
+	72, 73, 74, 75, 76, 77, 78, 90, 91, 92,
+	93, 94, 95, 136, 132, 133, 134, 135, 137, 138,
+	139, 141, 142, 80, 81, 0, 82, 0, 0, 114,
+	0, 0, 85, 0, 104, 86, 97, 118, 0, 0,
+	0, 61, 0, 0, 65, -2, 33, 51, 52, 53,
+	54, 55, 56, 58, 59, 0, 0, 0, 0, 0,
+	105, 107, 108, 121, 126, 128, 62, 63, 0, 37,
+	38, 39, 40, 41, 42, 43, 44, 47, 0, 0,
+	116, 117, 0, 99, 115, 0, 103, 0, -2, 0,
+	0, 0, 0, 0, 0, 101, 0, 106, 0, 0,
+	0, 100, 0, 98, 0, 0, 45, 46, 48, 0,
+	0, 102, 84, 0, 83, 49,
 }
 
 var yrTok1 = [...]int{
@@ -823,34 +823,34 @@ yrdefault:
 
 	case 2:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:221
+//line parser/grammar.y:223
 		{
 			ruleSet := asLexer(yrlex).ruleSet
 			ruleSet.Rules = append(ruleSet.Rules, yrDollar[2].rule)
 		}
 	case 3:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:226
+//line parser/grammar.y:228
 		{
 			ruleSet := asLexer(yrlex).ruleSet
 			ruleSet.Imports = append(ruleSet.Imports, yrDollar[2].s)
 		}
 	case 4:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:231
+//line parser/grammar.y:233
 		{
 			ruleSet := asLexer(yrlex).ruleSet
 			ruleSet.Includes = append(ruleSet.Includes, yrDollar[3].s)
 		}
 	case 5:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:236
+//line parser/grammar.y:238
 		{
 
 		}
 	case 6:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:244
+//line parser/grammar.y:246
 		{
 			if err := validateAscii(yrDollar[2].s); err != nil {
 				return asLexer(yrlex).setError(
@@ -861,7 +861,7 @@ yrdefault:
 		}
 	case 7:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:257
+//line parser/grammar.y:259
 		{
 			lexer := asLexer(yrlex)
 
@@ -882,7 +882,7 @@ yrdefault:
 		}
 	case 8:
 		yrDollar = yrS[yrpt-8 : yrpt+1]
-//line parser/grammar.y:276
+//line parser/grammar.y:278
 		{
 			yrDollar[4].rule.Tags = yrDollar[5].ss
 			yrDollar[4].rule.Meta = yrDollar[7].metas
@@ -890,86 +890,86 @@ yrdefault:
 		}
 	case 9:
 		yrDollar = yrS[yrpt-11 : yrpt+1]
-//line parser/grammar.y:282
+//line parser/grammar.y:284
 		{
 			yrDollar[4].rule.Condition = yrDollar[10].expr
 			yrVAL.rule = yrDollar[4].rule
 		}
 	case 10:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:291
+//line parser/grammar.y:293
 		{
 			yrVAL.metas = []*ast.Meta{}
 		}
 	case 11:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:295
+//line parser/grammar.y:297
 		{
 			yrVAL.metas = yrDollar[3].metas
 		}
 	case 12:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:303
+//line parser/grammar.y:305
 		{
 			yrVAL.yss = []ast.String{}
 		}
 	case 13:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:307
+//line parser/grammar.y:309
 		{
 			yrVAL.yss = yrDollar[3].yss
 		}
 	case 14:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:315
+//line parser/grammar.y:317
 		{
 			yrVAL.expr = yrDollar[3].expr
 		}
 	case 15:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:323
+//line parser/grammar.y:325
 		{
 			yrVAL.mod = 0
 		}
 	case 16:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:327
+//line parser/grammar.y:329
 		{
 			yrVAL.mod = yrDollar[1].mod | yrDollar[2].mod
 		}
 	case 17:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:335
+//line parser/grammar.y:337
 		{
 			yrVAL.mod = ModPrivate
 		}
 	case 18:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:339
+//line parser/grammar.y:341
 		{
 			yrVAL.mod = ModGlobal
 		}
 	case 19:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:347
+//line parser/grammar.y:349
 		{
 			yrVAL.ss = []string{}
 		}
 	case 20:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:351
+//line parser/grammar.y:353
 		{
 			yrVAL.ss = yrDollar[2].ss
 		}
 	case 21:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:359
+//line parser/grammar.y:361
 		{
 			yrVAL.ss = []string{yrDollar[1].s}
 		}
 	case 22:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:363
+//line parser/grammar.y:365
 		{
 			lexer := asLexer(yrlex)
 
@@ -984,19 +984,19 @@ yrdefault:
 		}
 	case 23:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:380
+//line parser/grammar.y:382
 		{
 			yrVAL.metas = []*ast.Meta{yrDollar[1].meta}
 		}
 	case 24:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:384
+//line parser/grammar.y:386
 		{
 			yrVAL.metas = append(yrDollar[1].metas, yrDollar[2].meta)
 		}
 	case 25:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:392
+//line parser/grammar.y:394
 		{
 			yrVAL.meta = &ast.Meta{
 				Key:   yrDollar[1].s,
@@ -1005,7 +1005,7 @@ yrdefault:
 		}
 	case 26:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:399
+//line parser/grammar.y:401
 		{
 			yrVAL.meta = &ast.Meta{
 				Key:   yrDollar[1].s,
@@ -1014,7 +1014,7 @@ yrdefault:
 		}
 	case 27:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:406
+//line parser/grammar.y:408
 		{
 			yrVAL.meta = &ast.Meta{
 				Key:   yrDollar[1].s,
@@ -1023,7 +1023,7 @@ yrdefault:
 		}
 	case 28:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:413
+//line parser/grammar.y:415
 		{
 			yrVAL.meta = &ast.Meta{
 				Key:   yrDollar[1].s,
@@ -1032,7 +1032,7 @@ yrdefault:
 		}
 	case 29:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:420
+//line parser/grammar.y:422
 		{
 			yrVAL.meta = &ast.Meta{
 				Key:   yrDollar[1].s,
@@ -1041,19 +1041,19 @@ yrdefault:
 		}
 	case 30:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:431
+//line parser/grammar.y:433
 		{
 			yrVAL.yss = []ast.String{yrDollar[1].ys}
 		}
 	case 31:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:435
+//line parser/grammar.y:437
 		{
 			yrVAL.yss = append(yrDollar[1].yss, yrDollar[2].ys)
 		}
 	case 32:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:443
+//line parser/grammar.y:445
 		{
 			if err := validateUTF8(yrDollar[3].s); err != nil {
 				return asLexer(yrlex).setError(
@@ -1062,7 +1062,7 @@ yrdefault:
 		}
 	case 33:
 		yrDollar = yrS[yrpt-5 : yrpt+1]
-//line parser/grammar.y:450
+//line parser/grammar.y:452
 		{
 			yrVAL.ys = &ast.TextString{
 				BaseString: ast.BaseString{
@@ -1085,7 +1085,7 @@ yrdefault:
 		}
 	case 34:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:471
+//line parser/grammar.y:473
 		{
 			yrVAL.ys = &ast.RegexpString{
 				BaseString: ast.BaseString{
@@ -1102,7 +1102,7 @@ yrdefault:
 		}
 	case 35:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:486
+//line parser/grammar.y:488
 		{
 			yrVAL.ys = &ast.HexString{
 				BaseString: ast.BaseString{
@@ -1115,13 +1115,13 @@ yrdefault:
 		}
 	case 36:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:501
+//line parser/grammar.y:503
 		{
 			yrVAL.smod = stringModifiers{}
 		}
 	case 37:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:505
+//line parser/grammar.y:507
 		{
 			if yrDollar[1].smod.modifiers&yrDollar[2].smod.modifiers != 0 {
 				return asLexer(yrlex).setError(
@@ -1143,49 +1143,49 @@ yrdefault:
 		}
 	case 38:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:528
+//line parser/grammar.y:530
 		{
 			yrVAL.smod = stringModifiers{modifiers: ModWide}
 		}
 	case 39:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:529
+//line parser/grammar.y:531
 		{
 			yrVAL.smod = stringModifiers{modifiers: ModASCII}
 		}
 	case 40:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:530
+//line parser/grammar.y:532
 		{
 			yrVAL.smod = stringModifiers{modifiers: ModNocase}
 		}
 	case 41:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:531
+//line parser/grammar.y:533
 		{
 			yrVAL.smod = stringModifiers{modifiers: ModFullword}
 		}
 	case 42:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:532
+//line parser/grammar.y:534
 		{
 			yrVAL.smod = stringModifiers{modifiers: ModPrivate}
 		}
 	case 43:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:533
+//line parser/grammar.y:535
 		{
 			yrVAL.smod = stringModifiers{modifiers: ModBase64}
 		}
 	case 44:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:534
+//line parser/grammar.y:536
 		{
 			yrVAL.smod = stringModifiers{modifiers: ModBase64Wide}
 		}
 	case 45:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:536
+//line parser/grammar.y:538
 		{
 			if err := validateAscii(yrDollar[3].s); err != nil {
 				return asLexer(yrlex).setError(
@@ -1205,7 +1205,7 @@ yrdefault:
 		}
 	case 46:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:554
+//line parser/grammar.y:556
 		{
 			if err := validateAscii(yrDollar[3].s); err != nil {
 				return asLexer(yrlex).setError(
@@ -1225,7 +1225,7 @@ yrdefault:
 		}
 	case 47:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:572
+//line parser/grammar.y:574
 		{
 			yrVAL.smod = stringModifiers{
 				modifiers: ModXor,
@@ -1235,7 +1235,7 @@ yrdefault:
 		}
 	case 48:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:580
+//line parser/grammar.y:582
 		{
 			yrVAL.smod = stringModifiers{
 				modifiers: ModXor,
@@ -1245,7 +1245,7 @@ yrdefault:
 		}
 	case 49:
 		yrDollar = yrS[yrpt-6 : yrpt+1]
-//line parser/grammar.y:588
+//line parser/grammar.y:590
 		{
 			lexer := asLexer(yrlex)
 
@@ -1275,73 +1275,73 @@ yrdefault:
 		}
 	case 50:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:620
+//line parser/grammar.y:622
 		{
 			yrVAL.mod = 0
 		}
 	case 51:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:624
+//line parser/grammar.y:626
 		{
 			yrVAL.mod = yrDollar[1].mod | yrDollar[2].mod
 		}
 	case 52:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:631
+//line parser/grammar.y:633
 		{
 			yrVAL.mod = ModWide
 		}
 	case 53:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:632
+//line parser/grammar.y:634
 		{
 			yrVAL.mod = ModASCII
 		}
 	case 54:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:633
+//line parser/grammar.y:635
 		{
 			yrVAL.mod = ModNocase
 		}
 	case 55:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:634
+//line parser/grammar.y:636
 		{
 			yrVAL.mod = ModFullword
 		}
 	case 56:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:635
+//line parser/grammar.y:637
 		{
 			yrVAL.mod = ModPrivate
 		}
 	case 57:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:641
+//line parser/grammar.y:643
 		{
 			yrVAL.mod = 0
 		}
 	case 58:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:645
+//line parser/grammar.y:647
 		{
 			yrVAL.mod = yrDollar[1].mod | yrDollar[2].mod
 		}
 	case 59:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:652
+//line parser/grammar.y:654
 		{
 			yrVAL.mod = ModPrivate
 		}
 	case 60:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:658
+//line parser/grammar.y:660
 		{
 			yrVAL.expr = &ast.Identifier{Identifier: yrDollar[1].s}
 		}
 	case 61:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:662
+//line parser/grammar.y:664
 		{
 			yrVAL.expr = &ast.MemberAccess{
 				Container: yrDollar[1].expr,
@@ -1350,7 +1350,7 @@ yrdefault:
 		}
 	case 62:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:669
+//line parser/grammar.y:671
 		{
 			yrVAL.expr = &ast.Subscripting{
 				Array: yrDollar[1].expr,
@@ -1359,7 +1359,7 @@ yrdefault:
 		}
 	case 63:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:676
+//line parser/grammar.y:678
 		{
 			yrVAL.expr = &ast.FunctionCall{
 				Callable:  yrDollar[1].expr,
@@ -1368,55 +1368,55 @@ yrdefault:
 		}
 	case 64:
 		yrDollar = yrS[yrpt-0 : yrpt+1]
-//line parser/grammar.y:687
+//line parser/grammar.y:689
 		{
 			yrVAL.exprs = []ast.Expression{}
 		}
 	case 65:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:691
+//line parser/grammar.y:693
 		{
 			yrVAL.exprs = yrDollar[1].exprs
 		}
 	case 66:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:698
+//line parser/grammar.y:700
 		{
 			yrVAL.exprs = []ast.Expression{yrDollar[1].expr}
 		}
 	case 67:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:702
+//line parser/grammar.y:704
 		{
 			yrVAL.exprs = append(yrDollar[1].exprs, yrDollar[3].expr)
 		}
 	case 68:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:710
+//line parser/grammar.y:712
 		{
 			yrVAL.reg = yrDollar[1].reg
 		}
 	case 69:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:718
+//line parser/grammar.y:720
 		{
 			yrVAL.expr = yrDollar[1].expr
 		}
 	case 70:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:726
+//line parser/grammar.y:728
 		{
 			yrVAL.expr = ast.KeywordTrue
 		}
 	case 71:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:730
+//line parser/grammar.y:732
 		{
 			yrVAL.expr = ast.KeywordFalse
 		}
 	case 72:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:734
+//line parser/grammar.y:736
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpMatches,
@@ -1425,7 +1425,7 @@ yrdefault:
 		}
 	case 73:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:741
+//line parser/grammar.y:743
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpContains,
@@ -1434,7 +1434,7 @@ yrdefault:
 		}
 	case 74:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:748
+//line parser/grammar.y:750
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpIContains,
@@ -1443,7 +1443,7 @@ yrdefault:
 		}
 	case 75:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:755
+//line parser/grammar.y:757
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpStartsWith,
@@ -1452,7 +1452,7 @@ yrdefault:
 		}
 	case 76:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:762
+//line parser/grammar.y:764
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpIStartsWith,
@@ -1461,7 +1461,7 @@ yrdefault:
 		}
 	case 77:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:769
+//line parser/grammar.y:771
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpEndsWith,
@@ -1470,7 +1470,7 @@ yrdefault:
 		}
 	case 78:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:776
+//line parser/grammar.y:778
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpIEndsWith,
@@ -1479,7 +1479,7 @@ yrdefault:
 		}
 	case 79:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:783
+//line parser/grammar.y:785
 		{
 			yrVAL.expr = &ast.StringIdentifier{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "$"),
@@ -1487,7 +1487,7 @@ yrdefault:
 		}
 	case 80:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:789
+//line parser/grammar.y:791
 		{
 			yrVAL.expr = &ast.StringIdentifier{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "$"),
@@ -1496,7 +1496,7 @@ yrdefault:
 		}
 	case 81:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:796
+//line parser/grammar.y:798
 		{
 			yrVAL.expr = &ast.StringIdentifier{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "$"),
@@ -1505,12 +1505,12 @@ yrdefault:
 		}
 	case 82:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:802
+//line parser/grammar.y:804
 		{
 		}
 	case 83:
 		yrDollar = yrS[yrpt-9 : yrpt+1]
-//line parser/grammar.y:804
+//line parser/grammar.y:806
 		{
 			yrVAL.expr = &ast.ForIn{
 				Quantifier: yrDollar[2].quantifier,
@@ -1521,7 +1521,7 @@ yrdefault:
 		}
 	case 84:
 		yrDollar = yrS[yrpt-8 : yrpt+1]
-//line parser/grammar.y:813
+//line parser/grammar.y:815
 		{
 			yrVAL.expr = &ast.ForOf{
 				Quantifier: yrDollar[2].quantifier,
@@ -1531,7 +1531,7 @@ yrdefault:
 		}
 	case 85:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:821
+//line parser/grammar.y:823
 		{
 			yrVAL.expr = &ast.Of{
 				Quantifier: yrDollar[1].quantifier,
@@ -1539,252 +1539,267 @@ yrdefault:
 			}
 		}
 	case 86:
+		yrDollar = yrS[yrpt-3 : yrpt+1]
+//line parser/grammar.y:830
+		{
+			yrVAL.expr = &ast.Of{
+				Quantifier: &ast.Quantifier{yrDollar[1].percentage},
+				Strings:    yrDollar[3].node,
+			}
+		}
+	case 87:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:828
+//line parser/grammar.y:837
 		{
 			yrVAL.expr = &ast.Not{yrDollar[2].expr}
 		}
-	case 87:
+	case 88:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:832
+//line parser/grammar.y:841
 		{
 			yrVAL.expr = operation(ast.OpAnd, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 88:
+	case 89:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:836
+//line parser/grammar.y:845
 		{
 			yrVAL.expr = operation(ast.OpOr, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 89:
+	case 90:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:840
+//line parser/grammar.y:849
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpLessThan,
 				Operands: []ast.Expression{yrDollar[1].expr, yrDollar[3].expr},
 			}
 		}
-	case 90:
+	case 91:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:847
+//line parser/grammar.y:856
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpGreaterThan,
 				Operands: []ast.Expression{yrDollar[1].expr, yrDollar[3].expr},
 			}
 		}
-	case 91:
+	case 92:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:854
+//line parser/grammar.y:863
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpLessOrEqual,
 				Operands: []ast.Expression{yrDollar[1].expr, yrDollar[3].expr},
 			}
 		}
-	case 92:
+	case 93:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:861
+//line parser/grammar.y:870
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpGreaterOrEqual,
 				Operands: []ast.Expression{yrDollar[1].expr, yrDollar[3].expr},
 			}
 		}
-	case 93:
+	case 94:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:868
+//line parser/grammar.y:877
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpEqual,
 				Operands: []ast.Expression{yrDollar[1].expr, yrDollar[3].expr},
 			}
 		}
-	case 94:
+	case 95:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:875
+//line parser/grammar.y:884
 		{
 			yrVAL.expr = &ast.Operation{
 				Operator: ast.OpNotEqual,
 				Operands: []ast.Expression{yrDollar[1].expr, yrDollar[3].expr},
 			}
 		}
-	case 95:
+	case 96:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:882
+//line parser/grammar.y:891
 		{
 			yrVAL.expr = yrDollar[1].expr
 		}
-	case 96:
+	case 97:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:886
+//line parser/grammar.y:895
 		{
 			yrVAL.expr = &ast.Group{yrDollar[2].expr}
 		}
-	case 97:
+	case 98:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:894
+//line parser/grammar.y:903
 		{
 			yrVAL.node = &ast.Enum{Values: yrDollar[2].exprs}
 		}
-	case 98:
+	case 99:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:898
+//line parser/grammar.y:907
 		{
 			yrVAL.node = yrDollar[1].rng
 		}
-	case 99:
+	case 100:
 		yrDollar = yrS[yrpt-5 : yrpt+1]
-//line parser/grammar.y:906
+//line parser/grammar.y:915
 		{
 			yrVAL.rng = &ast.Range{
 				Start: yrDollar[2].expr,
 				End:   yrDollar[4].expr,
 			}
 		}
-	case 100:
+	case 101:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:917
+//line parser/grammar.y:926
 		{
 			yrVAL.exprs = []ast.Expression{yrDollar[1].expr}
 		}
-	case 101:
+	case 102:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:921
+//line parser/grammar.y:930
 		{
 			yrVAL.exprs = append(yrDollar[1].exprs, yrDollar[3].expr)
 		}
-	case 102:
+	case 103:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:929
+//line parser/grammar.y:938
 		{
 			yrVAL.node = &ast.Enum{Values: yrDollar[2].exprs}
 		}
-	case 103:
+	case 104:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:933
+//line parser/grammar.y:942
 		{
 			yrVAL.node = ast.KeywordThem
 		}
-	case 104:
+	case 105:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:941
+//line parser/grammar.y:950
 		{
 			yrVAL.exprs = []ast.Expression{yrDollar[1].si}
 		}
-	case 105:
+	case 106:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:945
+//line parser/grammar.y:954
 		{
 			yrVAL.exprs = append(yrDollar[1].exprs, yrDollar[3].si)
 		}
-	case 106:
+	case 107:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:953
+//line parser/grammar.y:962
 		{
 			yrVAL.si = &ast.StringIdentifier{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "$"),
 			}
 		}
-	case 107:
+	case 108:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:959
+//line parser/grammar.y:968
 		{
 			yrVAL.si = &ast.StringIdentifier{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "$"),
 			}
 		}
-	case 108:
+	case 109:
+		yrDollar = yrS[yrpt-2 : yrpt+1]
+//line parser/grammar.y:978
+		{
+			yrVAL.percentage = &ast.Percentage{yrDollar[1].expr}
+		}
+	case 110:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:969
+//line parser/grammar.y:986
 		{
 			yrVAL.quantifier = &ast.Quantifier{yrDollar[1].expr}
 		}
-	case 109:
+	case 111:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:973
+//line parser/grammar.y:990
 		{
 			yrVAL.quantifier = &ast.Quantifier{ast.KeywordAll}
 		}
-	case 110:
+	case 112:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:977
+//line parser/grammar.y:994
 		{
 			yrVAL.quantifier = &ast.Quantifier{ast.KeywordAny}
 		}
-	case 111:
+	case 113:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:981
+//line parser/grammar.y:998
 		{
 			yrVAL.quantifier = &ast.Quantifier{ast.KeywordNone}
 		}
-	case 112:
+	case 114:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:989
+//line parser/grammar.y:1006
 		{
 			yrVAL.ss = []string{yrDollar[1].s}
 		}
-	case 113:
+	case 115:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:993
+//line parser/grammar.y:1010
 		{
 			yrVAL.ss = append(yrDollar[1].ss, yrDollar[3].s)
 		}
-	case 114:
+	case 116:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1000
+//line parser/grammar.y:1017
 		{
 			yrVAL.node = yrDollar[1].expr
 		}
-	case 115:
+	case 117:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1004
+//line parser/grammar.y:1021
 		{
 			yrVAL.node = yrDollar[1].node
 		}
-	case 116:
+	case 118:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1012
+//line parser/grammar.y:1029
 		{
 			yrVAL.expr = &ast.Group{yrDollar[2].expr}
 		}
-	case 117:
+	case 119:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1016
+//line parser/grammar.y:1033
 		{
 			yrVAL.expr = ast.KeywordFilesize
 		}
-	case 118:
+	case 120:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1020
+//line parser/grammar.y:1037
 		{
 			yrVAL.expr = ast.KeywordEntrypoint
 		}
-	case 119:
+	case 121:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:1024
+//line parser/grammar.y:1041
 		{
 			yrVAL.expr = &ast.FunctionCall{
 				Callable:  &ast.Identifier{Identifier: yrDollar[1].s},
 				Arguments: []ast.Expression{yrDollar[3].expr},
 			}
 		}
-	case 120:
+	case 122:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1031
+//line parser/grammar.y:1048
 		{
 			yrVAL.expr = &ast.LiteralInteger{yrDollar[1].i64}
 		}
-	case 121:
+	case 123:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1035
+//line parser/grammar.y:1052
 		{
 			yrVAL.expr = &ast.LiteralFloat{yrDollar[1].f64}
 		}
-	case 122:
+	case 124:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1039
+//line parser/grammar.y:1056
 		{
 			if err := validateUTF8(yrDollar[1].s); err != nil {
 				return asLexer(yrlex).setError(
@@ -1793,129 +1808,129 @@ yrdefault:
 
 			yrVAL.expr = &ast.LiteralString{yrDollar[1].s}
 		}
-	case 123:
+	case 125:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1048
+//line parser/grammar.y:1065
 		{
 			yrVAL.expr = &ast.StringCount{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "#"),
 			}
 		}
-	case 124:
+	case 126:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:1054
+//line parser/grammar.y:1071
 		{
 			yrVAL.expr = &ast.StringOffset{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "@"),
 				Index:      yrDollar[3].expr,
 			}
 		}
-	case 125:
+	case 127:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1061
+//line parser/grammar.y:1078
 		{
 			yrVAL.expr = &ast.StringOffset{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "@"),
 			}
 		}
-	case 126:
+	case 128:
 		yrDollar = yrS[yrpt-4 : yrpt+1]
-//line parser/grammar.y:1067
+//line parser/grammar.y:1084
 		{
 			yrVAL.expr = &ast.StringLength{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "!"),
 				Index:      yrDollar[3].expr,
 			}
 		}
-	case 127:
+	case 129:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1074
+//line parser/grammar.y:1091
 		{
 			yrVAL.expr = &ast.StringLength{
 				Identifier: strings.TrimPrefix(yrDollar[1].s, "!"),
 			}
 		}
-	case 128:
+	case 130:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1080
+//line parser/grammar.y:1097
 		{
 			yrVAL.expr = yrDollar[1].expr
 		}
-	case 129:
+	case 131:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:1084
+//line parser/grammar.y:1101
 		{
 			yrVAL.expr = &ast.Minus{yrDollar[2].expr}
 		}
-	case 130:
+	case 132:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1088
+//line parser/grammar.y:1105
 		{
 			yrVAL.expr = operation(ast.OpAdd, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 131:
+	case 133:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1092
+//line parser/grammar.y:1109
 		{
 			yrVAL.expr = operation(ast.OpSub, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 132:
+	case 134:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1096
+//line parser/grammar.y:1113
 		{
 			yrVAL.expr = operation(ast.OpMul, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 133:
+	case 135:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1100
+//line parser/grammar.y:1117
 		{
 			yrVAL.expr = operation(ast.OpDiv, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 134:
+	case 136:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1104
+//line parser/grammar.y:1121
 		{
 			yrVAL.expr = operation(ast.OpMod, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 135:
+	case 137:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1108
+//line parser/grammar.y:1125
 		{
 			yrVAL.expr = operation(ast.OpBitXor, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 136:
+	case 138:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1112
+//line parser/grammar.y:1129
 		{
 			yrVAL.expr = operation(ast.OpBitAnd, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 137:
+	case 139:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1116
+//line parser/grammar.y:1133
 		{
 			yrVAL.expr = operation(ast.OpBitOr, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 138:
+	case 140:
 		yrDollar = yrS[yrpt-2 : yrpt+1]
-//line parser/grammar.y:1120
+//line parser/grammar.y:1137
 		{
 			yrVAL.expr = &ast.BitwiseNot{yrDollar[2].expr}
 		}
-	case 139:
+	case 141:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1124
+//line parser/grammar.y:1141
 		{
 			yrVAL.expr = operation(ast.OpShiftLeft, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 140:
+	case 142:
 		yrDollar = yrS[yrpt-3 : yrpt+1]
-//line parser/grammar.y:1128
+//line parser/grammar.y:1145
 		{
 			yrVAL.expr = operation(ast.OpShiftRight, yrDollar[1].expr, yrDollar[3].expr)
 		}
-	case 141:
+	case 143:
 		yrDollar = yrS[yrpt-1 : yrpt+1]
-//line parser/grammar.y:1132
+//line parser/grammar.y:1149
 		{
 			yrVAL.expr = yrDollar[1].reg
 		}
diff --git a/pb/yara.pb.go b/pb/yara.pb.go
index afde91f..7abb669 100644
--- a/pb/yara.pb.go
+++ b/pb/yara.pb.go
@@ -1442,7 +1442,8 @@ func (x *Range) GetEnd() *Expression {
 	return nil
 }
 
-// Functions for reading data from a file at a specified offset or virtual address.
+// Functions for reading data from a file at a specified offset or virtual
+// address.
 type IntegerFunction struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1791,6 +1792,53 @@ func (x *IntegerEnumeration) GetValues() []*Expression {
 	return nil
 }
 
+type Percentage struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Expression *Expression `protobuf:"bytes,1,opt,name=expression" json:"expression,omitempty"`
+}
+
+func (x *Percentage) Reset() {
+	*x = Percentage{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_pb_yara_proto_msgTypes[19]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Percentage) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Percentage) ProtoMessage() {}
+
+func (x *Percentage) ProtoReflect() protoreflect.Message {
+	mi := &file_pb_yara_proto_msgTypes[19]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Percentage.ProtoReflect.Descriptor instead.
+func (*Percentage) Descriptor() ([]byte, []int) {
+	return file_pb_yara_proto_rawDescGZIP(), []int{19}
+}
+
+func (x *Percentage) GetExpression() *Expression {
+	if x != nil {
+		return x.Expression
+	}
+	return nil
+}
+
 // FOR expression, used as part of ForInExpressions and ForOrExpressions.
 // Can contain either an expression or a keyword.
 type ForExpression struct {
@@ -1801,13 +1849,14 @@ type ForExpression struct {
 	// Types that are assignable to For:
 	//	*ForExpression_Expression
 	//	*ForExpression_Keyword
+	//	*ForExpression_Percentage
 	For isForExpression_For `protobuf_oneof:"for"`
 }
 
 func (x *ForExpression) Reset() {
 	*x = ForExpression{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[19]
+		mi := &file_pb_yara_proto_msgTypes[20]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1820,7 +1869,7 @@ func (x *ForExpression) String() string {
 func (*ForExpression) ProtoMessage() {}
 
 func (x *ForExpression) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[19]
+	mi := &file_pb_yara_proto_msgTypes[20]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1833,7 +1882,7 @@ func (x *ForExpression) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ForExpression.ProtoReflect.Descriptor instead.
 func (*ForExpression) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{19}
+	return file_pb_yara_proto_rawDescGZIP(), []int{20}
 }
 
 func (m *ForExpression) GetFor() isForExpression_For {
@@ -1857,6 +1906,13 @@ func (x *ForExpression) GetKeyword() ForKeyword {
 	return ForKeyword_NONE
 }
 
+func (x *ForExpression) GetPercentage() *Percentage {
+	if x, ok := x.GetFor().(*ForExpression_Percentage); ok {
+		return x.Percentage
+	}
+	return nil
+}
+
 type isForExpression_For interface {
 	isForExpression_For()
 }
@@ -1869,13 +1925,18 @@ type ForExpression_Keyword struct {
 	Keyword ForKeyword `protobuf:"varint,2,opt,name=keyword,enum=ForKeyword,oneof"` // Example: "for all"
 }
 
+type ForExpression_Percentage struct {
+	Percentage *Percentage `protobuf:"bytes,3,opt,name=percentage,oneof"` // Example: "x%"
+}
+
 func (*ForExpression_Expression) isForExpression_For() {}
 
 func (*ForExpression_Keyword) isForExpression_For() {}
 
-// A ForOfExpression is satisfied if at least "expression" strings in "string_set"
-// satisfy "expression".
-// Example: for all of ($s1, $s2) : (@$ > 10)
+func (*ForExpression_Percentage) isForExpression_For() {}
+
+// A ForOfExpression is satisfied if at least "expression" strings in
+// "string_set" satisfy "expression". Example: for all of ($s1, $s2) : (@$ > 10)
 type ForOfExpression struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1892,7 +1953,7 @@ type ForOfExpression struct {
 func (x *ForOfExpression) Reset() {
 	*x = ForOfExpression{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[20]
+		mi := &file_pb_yara_proto_msgTypes[21]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1905,7 +1966,7 @@ func (x *ForOfExpression) String() string {
 func (*ForOfExpression) ProtoMessage() {}
 
 func (x *ForOfExpression) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[20]
+	mi := &file_pb_yara_proto_msgTypes[21]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1918,7 +1979,7 @@ func (x *ForOfExpression) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ForOfExpression.ProtoReflect.Descriptor instead.
 func (*ForOfExpression) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{20}
+	return file_pb_yara_proto_rawDescGZIP(), []int{21}
 }
 
 func (x *ForOfExpression) GetForExpression() *ForExpression {
@@ -1957,7 +2018,7 @@ type StringSet struct {
 func (x *StringSet) Reset() {
 	*x = StringSet{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[21]
+		mi := &file_pb_yara_proto_msgTypes[22]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1970,7 +2031,7 @@ func (x *StringSet) String() string {
 func (*StringSet) ProtoMessage() {}
 
 func (x *StringSet) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[21]
+	mi := &file_pb_yara_proto_msgTypes[22]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1983,7 +2044,7 @@ func (x *StringSet) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringSet.ProtoReflect.Descriptor instead.
 func (*StringSet) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{21}
+	return file_pb_yara_proto_rawDescGZIP(), []int{22}
 }
 
 func (m *StringSet) GetSet() isStringSet_Set {
@@ -2040,7 +2101,7 @@ type StringEnumeration struct {
 func (x *StringEnumeration) Reset() {
 	*x = StringEnumeration{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[22]
+		mi := &file_pb_yara_proto_msgTypes[23]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2053,7 +2114,7 @@ func (x *StringEnumeration) String() string {
 func (*StringEnumeration) ProtoMessage() {}
 
 func (x *StringEnumeration) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[22]
+	mi := &file_pb_yara_proto_msgTypes[23]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2066,7 +2127,7 @@ func (x *StringEnumeration) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringEnumeration.ProtoReflect.Descriptor instead.
 func (*StringEnumeration) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{22}
+	return file_pb_yara_proto_rawDescGZIP(), []int{23}
 }
 
 func (x *StringEnumeration) GetItems() []*StringEnumeration_StringEnumerationItem {
@@ -2103,13 +2164,14 @@ type Expression struct {
 	//	*Expression_StringLength
 	//	*Expression_Identifier
 	//	*Expression_IntegerFunction
+	//	*Expression_PercentageExpression
 	Expression isExpression_Expression `protobuf_oneof:"expression"`
 }
 
 func (x *Expression) Reset() {
 	*x = Expression{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[23]
+		mi := &file_pb_yara_proto_msgTypes[24]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2122,7 +2184,7 @@ func (x *Expression) String() string {
 func (*Expression) ProtoMessage() {}
 
 func (x *Expression) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[23]
+	mi := &file_pb_yara_proto_msgTypes[24]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2135,7 +2197,7 @@ func (x *Expression) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Expression.ProtoReflect.Descriptor instead.
 func (*Expression) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{23}
+	return file_pb_yara_proto_rawDescGZIP(), []int{24}
 }
 
 func (m *Expression) GetExpression() isExpression_Expression {
@@ -2285,6 +2347,13 @@ func (x *Expression) GetIntegerFunction() *IntegerFunction {
 	return nil
 }
 
+func (x *Expression) GetPercentageExpression() *Percentage {
+	if x, ok := x.GetExpression().(*Expression_PercentageExpression); ok {
+		return x.PercentageExpression
+	}
+	return nil
+}
+
 type isExpression_Expression interface {
 	isExpression_Expression()
 }
@@ -2369,6 +2438,10 @@ type Expression_IntegerFunction struct {
 	IntegerFunction *IntegerFunction `protobuf:"bytes,20,opt,name=integer_function,json=integerFunction,oneof"`
 }
 
+type Expression_PercentageExpression struct {
+	PercentageExpression *Percentage `protobuf:"bytes,21,opt,name=percentage_expression,json=percentageExpression,oneof"`
+}
+
 func (*Expression_BoolValue) isExpression_Expression() {}
 
 func (*Expression_BinaryExpression) isExpression_Expression() {}
@@ -2409,6 +2482,8 @@ func (*Expression_Identifier) isExpression_Expression() {}
 
 func (*Expression_IntegerFunction) isExpression_Expression() {}
 
+func (*Expression_PercentageExpression) isExpression_Expression() {}
+
 // Refers to the offset or virtual address at which a string (or, optionally,
 // the i-th occurence of the string) is found.
 // Examples:
@@ -2428,7 +2503,7 @@ type StringOffset struct {
 func (x *StringOffset) Reset() {
 	*x = StringOffset{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[24]
+		mi := &file_pb_yara_proto_msgTypes[25]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2441,7 +2516,7 @@ func (x *StringOffset) String() string {
 func (*StringOffset) ProtoMessage() {}
 
 func (x *StringOffset) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[24]
+	mi := &file_pb_yara_proto_msgTypes[25]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2454,7 +2529,7 @@ func (x *StringOffset) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringOffset.ProtoReflect.Descriptor instead.
 func (*StringOffset) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{24}
+	return file_pb_yara_proto_rawDescGZIP(), []int{25}
 }
 
 func (x *StringOffset) GetStringIdentifier() string {
@@ -2491,7 +2566,7 @@ type StringLength struct {
 func (x *StringLength) Reset() {
 	*x = StringLength{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[25]
+		mi := &file_pb_yara_proto_msgTypes[26]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2504,7 +2579,7 @@ func (x *StringLength) String() string {
 func (*StringLength) ProtoMessage() {}
 
 func (x *StringLength) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[25]
+	mi := &file_pb_yara_proto_msgTypes[26]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2517,7 +2592,7 @@ func (x *StringLength) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use StringLength.ProtoReflect.Descriptor instead.
 func (*StringLength) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{25}
+	return file_pb_yara_proto_rawDescGZIP(), []int{26}
 }
 
 func (x *StringLength) GetStringIdentifier() string {
@@ -2552,7 +2627,7 @@ type Identifier struct {
 func (x *Identifier) Reset() {
 	*x = Identifier{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[26]
+		mi := &file_pb_yara_proto_msgTypes[27]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2565,7 +2640,7 @@ func (x *Identifier) String() string {
 func (*Identifier) ProtoMessage() {}
 
 func (x *Identifier) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[26]
+	mi := &file_pb_yara_proto_msgTypes[27]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2578,7 +2653,7 @@ func (x *Identifier) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Identifier.ProtoReflect.Descriptor instead.
 func (*Identifier) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{26}
+	return file_pb_yara_proto_rawDescGZIP(), []int{27}
 }
 
 func (x *Identifier) GetItems() []*Identifier_IdentifierItem {
@@ -2601,7 +2676,7 @@ type Expressions struct {
 func (x *Expressions) Reset() {
 	*x = Expressions{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[27]
+		mi := &file_pb_yara_proto_msgTypes[28]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2614,7 +2689,7 @@ func (x *Expressions) String() string {
 func (*Expressions) ProtoMessage() {}
 
 func (x *Expressions) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[27]
+	mi := &file_pb_yara_proto_msgTypes[28]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2627,7 +2702,7 @@ func (x *Expressions) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Expressions.ProtoReflect.Descriptor instead.
 func (*Expressions) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{27}
+	return file_pb_yara_proto_rawDescGZIP(), []int{28}
 }
 
 func (x *Expressions) GetTerms() []*Expression {
@@ -2660,7 +2735,7 @@ type Rule struct {
 func (x *Rule) Reset() {
 	*x = Rule{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[28]
+		mi := &file_pb_yara_proto_msgTypes[29]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2673,7 +2748,7 @@ func (x *Rule) String() string {
 func (*Rule) ProtoMessage() {}
 
 func (x *Rule) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[28]
+	mi := &file_pb_yara_proto_msgTypes[29]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2686,7 +2761,7 @@ func (x *Rule) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Rule.ProtoReflect.Descriptor instead.
 func (*Rule) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{28}
+	return file_pb_yara_proto_rawDescGZIP(), []int{29}
 }
 
 func (x *Rule) GetModifiers() *RuleModifiers {
@@ -2752,7 +2827,7 @@ type RuleSet struct {
 func (x *RuleSet) Reset() {
 	*x = RuleSet{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[29]
+		mi := &file_pb_yara_proto_msgTypes[30]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2765,7 +2840,7 @@ func (x *RuleSet) String() string {
 func (*RuleSet) ProtoMessage() {}
 
 func (x *RuleSet) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[29]
+	mi := &file_pb_yara_proto_msgTypes[30]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2778,7 +2853,7 @@ func (x *RuleSet) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use RuleSet.ProtoReflect.Descriptor instead.
 func (*RuleSet) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{29}
+	return file_pb_yara_proto_rawDescGZIP(), []int{30}
 }
 
 func (x *RuleSet) GetImports() []string {
@@ -2818,7 +2893,7 @@ type StringEnumeration_StringEnumerationItem struct {
 func (x *StringEnumeration_StringEnumerationItem) Reset() {
 	*x = StringEnumeration_StringEnumerationItem{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[30]
+		mi := &file_pb_yara_proto_msgTypes[31]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2831,7 +2906,7 @@ func (x *StringEnumeration_StringEnumerationItem) String() string {
 func (*StringEnumeration_StringEnumerationItem) ProtoMessage() {}
 
 func (x *StringEnumeration_StringEnumerationItem) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[30]
+	mi := &file_pb_yara_proto_msgTypes[31]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2844,7 +2919,7 @@ func (x *StringEnumeration_StringEnumerationItem) ProtoReflect() protoreflect.Me
 
 // Deprecated: Use StringEnumeration_StringEnumerationItem.ProtoReflect.Descriptor instead.
 func (*StringEnumeration_StringEnumerationItem) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{22, 0}
+	return file_pb_yara_proto_rawDescGZIP(), []int{23, 0}
 }
 
 func (x *StringEnumeration_StringEnumerationItem) GetStringIdentifier() string {
@@ -2876,7 +2951,7 @@ type Identifier_IdentifierItem struct {
 func (x *Identifier_IdentifierItem) Reset() {
 	*x = Identifier_IdentifierItem{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_pb_yara_proto_msgTypes[31]
+		mi := &file_pb_yara_proto_msgTypes[32]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -2889,7 +2964,7 @@ func (x *Identifier_IdentifierItem) String() string {
 func (*Identifier_IdentifierItem) ProtoMessage() {}
 
 func (x *Identifier_IdentifierItem) ProtoReflect() protoreflect.Message {
-	mi := &file_pb_yara_proto_msgTypes[31]
+	mi := &file_pb_yara_proto_msgTypes[32]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -2902,7 +2977,7 @@ func (x *Identifier_IdentifierItem) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Identifier_IdentifierItem.ProtoReflect.Descriptor instead.
 func (*Identifier_IdentifierItem) Descriptor() ([]byte, []int) {
-	return file_pb_yara_proto_rawDescGZIP(), []int{26, 0}
+	return file_pb_yara_proto_rawDescGZIP(), []int{27, 0}
 }
 
 func (m *Identifier_IdentifierItem) GetItem() isIdentifier_IdentifierItem_Item {
@@ -3114,160 +3189,173 @@ var file_pb_yara_proto_rawDesc = []byte{
 	0x0a, 0x12, 0x49, 0x6e, 0x74, 0x65, 0x67, 0x65, 0x72, 0x45, 0x6e, 0x75, 0x6d, 0x65, 0x72, 0x61,
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 }
 
 var (
@@ -3283,7 +3371,7 @@ func file_pb_yara_proto_rawDescGZIP() []byte {
 }
 
 var file_pb_yara_proto_enumTypes = make([]protoimpl.EnumInfo, 5)
-var file_pb_yara_proto_msgTypes = make([]protoimpl.MessageInfo, 32)
+var file_pb_yara_proto_msgTypes = make([]protoimpl.MessageInfo, 33)
 var file_pb_yara_proto_goTypes = []interface{}{
 	(Keyword)(0),                   // 0: Keyword
 	(ForKeyword)(0),                // 1: ForKeyword
@@ -3309,19 +3397,20 @@ var file_pb_yara_proto_goTypes = []interface{}{
 	(*Iterator)(nil),               // 21: Iterator
 	(*IntegerSet)(nil),             // 22: IntegerSet
 	(*IntegerEnumeration)(nil),     // 23: IntegerEnumeration
-	(*ForExpression)(nil),          // 24: ForExpression
-	(*ForOfExpression)(nil),        // 25: ForOfExpression
-	(*StringSet)(nil),              // 26: StringSet
-	(*StringEnumeration)(nil),      // 27: StringEnumeration
-	(*Expression)(nil),             // 28: Expression
-	(*StringOffset)(nil),           // 29: StringOffset
-	(*StringLength)(nil),           // 30: StringLength
-	(*Identifier)(nil),             // 31: Identifier
-	(*Expressions)(nil),            // 32: Expressions
-	(*Rule)(nil),                   // 33: Rule
-	(*RuleSet)(nil),                // 34: RuleSet
-	(*StringEnumeration_StringEnumerationItem)(nil), // 35: StringEnumeration.StringEnumerationItem
-	(*Identifier_IdentifierItem)(nil),               // 36: Identifier.IdentifierItem
+	(*Percentage)(nil),             // 24: Percentage
+	(*ForExpression)(nil),          // 25: ForExpression
+	(*ForOfExpression)(nil),        // 26: ForOfExpression
+	(*StringSet)(nil),              // 27: StringSet
+	(*StringEnumeration)(nil),      // 28: StringEnumeration
+	(*Expression)(nil),             // 29: Expression
+	(*StringOffset)(nil),           // 30: StringOffset
+	(*StringLength)(nil),           // 31: StringLength
+	(*Identifier)(nil),             // 32: Identifier
+	(*Expressions)(nil),            // 33: Expressions
+	(*Rule)(nil),                   // 34: Rule
+	(*RuleSet)(nil),                // 35: RuleSet
+	(*StringEnumeration_StringEnumerationItem)(nil), // 36: StringEnumeration.StringEnumerationItem
+	(*Identifier_IdentifierItem)(nil),               // 37: Identifier.IdentifierItem
 }
 var file_pb_yara_proto_depIdxs = []int32{
 	9,  // 0: String.text:type_name -> TextString
@@ -3335,59 +3424,62 @@ var file_pb_yara_proto_depIdxs = []int32{
 	13, // 8: HexToken.alternative:type_name -> HexAlternative
 	11, // 9: HexAlternative.tokens:type_name -> HexTokens
 	3,  // 10: BinaryExpression.operator:type_name -> BinaryExpression.Operator
-	28, // 11: BinaryExpression.left:type_name -> Expression
-	28, // 12: BinaryExpression.right:type_name -> Expression
+	29, // 11: BinaryExpression.left:type_name -> Expression
+	29, // 12: BinaryExpression.right:type_name -> Expression
 	4,  // 13: UnaryExpression.operator:type_name -> UnaryExpression.Operator
-	28, // 14: UnaryExpression.expression:type_name -> Expression
-	28, // 15: Range.start:type_name -> Expression
-	28, // 16: Range.end:type_name -> Expression
-	28, // 17: IntegerFunction.argument:type_name -> Expression
-	24, // 18: ForInExpression.for_expression:type_name -> ForExpression
+	29, // 14: UnaryExpression.expression:type_name -> Expression
+	29, // 15: Range.start:type_name -> Expression
+	29, // 16: Range.end:type_name -> Expression
+	29, // 17: IntegerFunction.argument:type_name -> Expression
+	25, // 18: ForInExpression.for_expression:type_name -> ForExpression
 	21, // 19: ForInExpression.iterator:type_name -> Iterator
-	28, // 20: ForInExpression.expression:type_name -> Expression
+	29, // 20: ForInExpression.expression:type_name -> Expression
 	22, // 21: Iterator.integer_set:type_name -> IntegerSet
-	31, // 22: Iterator.identifier:type_name -> Identifier
+	32, // 22: Iterator.identifier:type_name -> Identifier
 	23, // 23: IntegerSet.integer_enumeration:type_name -> IntegerEnumeration
 	18, // 24: IntegerSet.range:type_name -> Range
-	28, // 25: IntegerEnumeration.values:type_name -> Expression
-	28, // 26: ForExpression.expression:type_name -> Expression
-	1,  // 27: ForExpression.keyword:type_name -> ForKeyword
-	24, // 28: ForOfExpression.for_expression:type_name -> ForExpression
-	26, // 29: ForOfExpression.string_set:type_name -> StringSet
-	28, // 30: ForOfExpression.expression:type_name -> Expression
-	27, // 31: StringSet.strings:type_name -> StringEnumeration
-	2,  // 32: StringSet.keyword:type_name -> StringSetKeyword
-	35, // 33: StringEnumeration.items:type_name -> StringEnumeration.StringEnumerationItem
-	16, // 34: Expression.binary_expression:type_name -> BinaryExpression
-	17, // 35: Expression.unary_expression:type_name -> UnaryExpression
-	20, // 36: Expression.for_in_expression:type_name -> ForInExpression
-	25, // 37: Expression.for_of_expression:type_name -> ForOfExpression
-	28, // 38: Expression.not_expression:type_name -> Expression
-	32, // 39: Expression.or_expression:type_name -> Expressions
-	32, // 40: Expression.and_expression:type_name -> Expressions
-	18, // 41: Expression.range:type_name -> Range
-	10, // 42: Expression.regexp:type_name -> Regexp
-	0,  // 43: Expression.keyword:type_name -> Keyword
-	29, // 44: Expression.string_offset:type_name -> StringOffset
-	30, // 45: Expression.string_length:type_name -> StringLength
-	31, // 46: Expression.identifier:type_name -> Identifier
-	19, // 47: Expression.integer_function:type_name -> IntegerFunction
-	28, // 48: StringOffset.index:type_name -> Expression
-	28, // 49: StringLength.index:type_name -> Expression
-	36, // 50: Identifier.items:type_name -> Identifier.IdentifierItem
-	28, // 51: Expressions.terms:type_name -> Expression
-	5,  // 52: Rule.modifiers:type_name -> RuleModifiers
-	6,  // 53: Rule.meta:type_name -> Meta
-	7,  // 54: Rule.strings:type_name -> String
-	28, // 55: Rule.condition:type_name -> Expression
-	33, // 56: RuleSet.rules:type_name -> Rule
-	28, // 57: Identifier.IdentifierItem.index:type_name -> Expression
-	32, // 58: Identifier.IdentifierItem.arguments:type_name -> Expressions
-	59, // [59:59] is the sub-list for method output_type
-	59, // [59:59] is the sub-list for method input_type
-	59, // [59:59] is the sub-list for extension type_name
-	59, // [59:59] is the sub-list for extension extendee
-	0,  // [0:59] is the sub-list for field type_name
+	29, // 25: IntegerEnumeration.values:type_name -> Expression
+	29, // 26: Percentage.expression:type_name -> Expression
+	29, // 27: ForExpression.expression:type_name -> Expression
+	1,  // 28: ForExpression.keyword:type_name -> ForKeyword
+	24, // 29: ForExpression.percentage:type_name -> Percentage
+	25, // 30: ForOfExpression.for_expression:type_name -> ForExpression
+	27, // 31: ForOfExpression.string_set:type_name -> StringSet
+	29, // 32: ForOfExpression.expression:type_name -> Expression
+	28, // 33: StringSet.strings:type_name -> StringEnumeration
+	2,  // 34: StringSet.keyword:type_name -> StringSetKeyword
+	36, // 35: StringEnumeration.items:type_name -> StringEnumeration.StringEnumerationItem
+	16, // 36: Expression.binary_expression:type_name -> BinaryExpression
+	17, // 37: Expression.unary_expression:type_name -> UnaryExpression
+	20, // 38: Expression.for_in_expression:type_name -> ForInExpression
+	26, // 39: Expression.for_of_expression:type_name -> ForOfExpression
+	29, // 40: Expression.not_expression:type_name -> Expression
+	33, // 41: Expression.or_expression:type_name -> Expressions
+	33, // 42: Expression.and_expression:type_name -> Expressions
+	18, // 43: Expression.range:type_name -> Range
+	10, // 44: Expression.regexp:type_name -> Regexp
+	0,  // 45: Expression.keyword:type_name -> Keyword
+	30, // 46: Expression.string_offset:type_name -> StringOffset
+	31, // 47: Expression.string_length:type_name -> StringLength
+	32, // 48: Expression.identifier:type_name -> Identifier
+	19, // 49: Expression.integer_function:type_name -> IntegerFunction
+	24, // 50: Expression.percentage_expression:type_name -> Percentage
+	29, // 51: StringOffset.index:type_name -> Expression
+	29, // 52: StringLength.index:type_name -> Expression
+	37, // 53: Identifier.items:type_name -> Identifier.IdentifierItem
+	29, // 54: Expressions.terms:type_name -> Expression
+	5,  // 55: Rule.modifiers:type_name -> RuleModifiers
+	6,  // 56: Rule.meta:type_name -> Meta
+	7,  // 57: Rule.strings:type_name -> String
+	29, // 58: Rule.condition:type_name -> Expression
+	34, // 59: RuleSet.rules:type_name -> Rule
+	29, // 60: Identifier.IdentifierItem.index:type_name -> Expression
+	33, // 61: Identifier.IdentifierItem.arguments:type_name -> Expressions
+	62, // [62:62] is the sub-list for method output_type
+	62, // [62:62] is the sub-list for method input_type
+	62, // [62:62] is the sub-list for extension type_name
+	62, // [62:62] is the sub-list for extension extendee
+	0,  // [0:62] is the sub-list for field type_name
 }
 
 func init() { file_pb_yara_proto_init() }
@@ -3625,7 +3717,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[19].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ForExpression); i {
+			switch v := v.(*Percentage); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3637,7 +3729,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[20].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ForOfExpression); i {
+			switch v := v.(*ForExpression); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3649,7 +3741,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[21].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringSet); i {
+			switch v := v.(*ForOfExpression); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3661,7 +3753,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[22].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringEnumeration); i {
+			switch v := v.(*StringSet); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3673,7 +3765,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[23].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Expression); i {
+			switch v := v.(*StringEnumeration); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3685,7 +3777,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[24].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringOffset); i {
+			switch v := v.(*Expression); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3697,7 +3789,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[25].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringLength); i {
+			switch v := v.(*StringOffset); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3709,7 +3801,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[26].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Identifier); i {
+			switch v := v.(*StringLength); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3721,7 +3813,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[27].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Expressions); i {
+			switch v := v.(*Identifier); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3733,7 +3825,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[28].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Rule); i {
+			switch v := v.(*Expressions); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3745,7 +3837,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[29].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*RuleSet); i {
+			switch v := v.(*Rule); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3757,7 +3849,7 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[30].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*StringEnumeration_StringEnumerationItem); i {
+			switch v := v.(*RuleSet); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -3769,6 +3861,18 @@ func file_pb_yara_proto_init() {
 			}
 		}
 		file_pb_yara_proto_msgTypes[31].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringEnumeration_StringEnumerationItem); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_pb_yara_proto_msgTypes[32].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Identifier_IdentifierItem); i {
 			case 0:
 				return &v.state
@@ -3804,15 +3908,16 @@ func file_pb_yara_proto_init() {
 		(*IntegerSet_IntegerEnumeration)(nil),
 		(*IntegerSet_Range)(nil),
 	}
-	file_pb_yara_proto_msgTypes[19].OneofWrappers = []interface{}{
+	file_pb_yara_proto_msgTypes[20].OneofWrappers = []interface{}{
 		(*ForExpression_Expression)(nil),
 		(*ForExpression_Keyword)(nil),
+		(*ForExpression_Percentage)(nil),
 	}
-	file_pb_yara_proto_msgTypes[21].OneofWrappers = []interface{}{
+	file_pb_yara_proto_msgTypes[22].OneofWrappers = []interface{}{
 		(*StringSet_Strings)(nil),
 		(*StringSet_Keyword)(nil),
 	}
-	file_pb_yara_proto_msgTypes[23].OneofWrappers = []interface{}{
+	file_pb_yara_proto_msgTypes[24].OneofWrappers = []interface{}{
 		(*Expression_BoolValue)(nil),
 		(*Expression_BinaryExpression)(nil),
 		(*Expression_UnaryExpression)(nil),
@@ -3833,8 +3938,9 @@ func file_pb_yara_proto_init() {
 		(*Expression_StringLength)(nil),
 		(*Expression_Identifier)(nil),
 		(*Expression_IntegerFunction)(nil),
+		(*Expression_PercentageExpression)(nil),
 	}
-	file_pb_yara_proto_msgTypes[31].OneofWrappers = []interface{}{
+	file_pb_yara_proto_msgTypes[32].OneofWrappers = []interface{}{
 		(*Identifier_IdentifierItem_Identifier)(nil),
 		(*Identifier_IdentifierItem_Index)(nil),
 		(*Identifier_IdentifierItem_Arguments)(nil),
@@ -3845,7 +3951,7 @@ func file_pb_yara_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_pb_yara_proto_rawDesc,
 			NumEnums:      5,
-			NumMessages:   32,
+			NumMessages:   33,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/pb/yara.proto b/pb/yara.proto
index 3b49c55..58c3019 100644
--- a/pb/yara.proto
+++ b/pb/yara.proto
@@ -271,12 +271,17 @@ message IntegerEnumeration {
   repeated Expression values = 1;
 }
 
+message Percentage {
+  optional Expression expression = 1;
+}
+
 // FOR expression, used as part of ForInExpressions and ForOrExpressions.
 // Can contain either an expression or a keyword.
 message ForExpression {
   oneof for {
     Expression expression = 1;  // Example: "for 10"
     ForKeyword keyword = 2;     // Example: "for all"
+    Percentage percentage = 3;  // Example: "x%"
   }
 }
 
@@ -370,6 +375,7 @@ message Expression {
     StringLength string_length = 18;
     Identifier identifier = 19;
     IntegerFunction integer_function = 20;
+    Percentage percentage_expression = 21;
   }
 }
 
diff --git a/serialize.go b/serialize.go
index 3682136..c39da37 100644
--- a/serialize.go
+++ b/serialize.go
@@ -533,6 +533,16 @@ func (ys *YaraSerializer) serializeHexAlternative(alt *pb.HexAlternative) error
 	return nil
 }
 
+func (ys *YaraSerializer) serializePercentage(p *pb.Percentage) error {
+	if err := ys.SerializeExpression(p.Expression); err != nil {
+		return err
+	}
+	if err := ys.writeString("%"); err != nil {
+		return err
+	}
+	return nil
+}
+
 // SerializeExpression serializes an Expression in a YARA rule condition.
 func (ys *YaraSerializer) SerializeExpression(e *pb.Expression) error {
 	switch val := e.GetExpression().(type) {
@@ -583,6 +593,8 @@ func (ys *YaraSerializer) SerializeExpression(e *pb.Expression) error {
 		return ys.serializeStringLength(e.GetStringLength())
 	case *pb.Expression_StringCount:
 		return ys.writeString(e.GetStringCount())
+	case *pb.Expression_PercentageExpression:
+		return ys.serializePercentage(e.GetPercentageExpression())
 	default:
 		return fmt.Errorf(`Unsupported Expression type "%T"`, val)
 	}
diff --git a/tests/grammar_test.go b/tests/grammar_test.go
index c0994d7..fae0c1f 100644
--- a/tests/grammar_test.go
+++ b/tests/grammar_test.go
@@ -262,6 +262,22 @@ rule KEYWORD_NONE {
   condition:
     none of them
 }
+
+rule PERCENT_OF {
+  strings:
+    $s0 = "AXSERS"
+    $s1 = "WXSMTS"
+  condition:
+    50% of them
+}
+
+rule PERCENT_OF_IDENTIFIER {
+  strings:
+    $s0 = "AXSERS"
+    $s1 = "WXSMTS"
+  condition:
+    x% of them
+}
 `
 
 func TestRulesetParsing(t *testing.T) {