Break up into search sections by <h2> (##) only

Closes #1875

lib/ex_doc/formatter/html/search_data.ex

@@ -125,7 +125,7 @@ defmodule ExDoc.Formatter.HTML.SearchData do
   end
 
   defp extract_sections_from_markdown(string) do
-    [intro | sections] = Regex.split(~r/## (?<header>\b.+)/, string, include_captures: true)
+    [intro | sections] = Regex.split(~r/(?<!#)## (?<header>\b.+)/, string, include_captures: true)
 
     sections =
       for [header, section] <- Enum.chunk_every(sections, 2) do

test/ex_doc/formatter/html/search_data_test.exs

@@ -14,6 +14,10 @@ defmodule ExDoc.Formatter.HTML.SearchDataTest do
         ## Section 1
 
         Section Content 1.
+
+        ### Section 1a
+
+        Section Content 1a.
         """
       end
       ''')
@@ -32,7 +36,14 @@ defmodule ExDoc.Formatter.HTML.SearchDataTest do
     assert item2["ref"] == "SearchFoo.html#module-section-1"
     assert item2["type"] == "module"
     assert item2["title"] == "Section 1 - SearchFoo"
-    assert item2["doc"] == "Section Content 1."
+
+    assert item2["doc"] == """
+           Section Content 1.
+
+           ### Section 1a
+
+           Section Content 1a.\
+           """
   end
 
   test "Mix task", c do
@@ -54,7 +65,7 @@ defmodule ExDoc.Formatter.HTML.SearchDataTest do
 
     assert item1["ref"] == "Mix.Tasks.SearchItemTest.html"
     assert item1["type"] == "task"
-    # assert item1["title"] == "mix search_item_test"
+    assert item1["title"] == "mix search_item_test"
     assert item1["doc"] == "Test task."
 
     assert item2["ref"] == "Mix.Tasks.SearchItemTest.html#module-section-1"