feat: validate mail/password

assets/l10n/intl_en.arb

@@ -2549,11 +2549,13 @@
     "register_pleaseConfirmYourPassword": "Please confirm your password",
     "register_notSamePassword": "Passwords don't match",
     "register_requiredField": "This field is required",
+    "register_emailError": "Please enter a valid email",
     "register_passwordErrorOne": "Password must be 3-16 characters long and contain only lowercase letters and numbers.",
     "register_passwordErrorTwo": "Password cannot contain common keywords.",
     "username_pageTitle": "Choose Username",
     "username_yourPosition": "Your position in the list:",
     "username_itsYourTurn": "It's your turn!",
     "username_changeUsername": "Choose your Tawkie name",
-    "username_advertisement": "This username is reserved for you. If you change it, you risk losing it."
+    "username_advertisement": "This username is reserved for you. If you change it, you risk losing it.",
+    "username_success": "Successful name change for"
 }

lib/pages/register/register.dart

@@ -36,12 +36,27 @@ class RegisterController extends State<Register> {
   void toggleShowPassword() =>
       setState(() => showPassword = !loading && !showPassword);
 
+  bool _validateEmail(String email) {
+    // Define regex to validate email format
+    final RegExp emailRegex = RegExp(
+      r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$',
+    );
+
+    // Check if the email matches the regex
+    if (!emailRegex.hasMatch(email)) {
+      setState(() => emailError = L10n.of(context)?.register_emailError);
+      return false;
+    }
+
+    // Reset email error if valid
+    setState(() => emailError = null);
+    return true;
+  }
+
   bool _validatePassword(String password) {
     // Define regex to validate password format
-    final RegExp passwordRegex = RegExp(r'^[a-z0-9]{3,16}$');
-
-    // List of keywords to check
-    final List<String> keywords = ['password', '123456', 'qwerty'];
+    final RegExp passwordRegex =
+        RegExp(r'^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{3,16}$');
 
     // Check that the password matches the regex
     if (!passwordRegex.hasMatch(password)) {
@@ -51,6 +66,7 @@ class RegisterController extends State<Register> {
     }
 
     // Check if the password contains one of the following keywords
+    final List<String> keywords = ['password', '123456', 'qwerty'];
     for (final keyword in keywords) {
       if (password.contains(keyword)) {
         setState(
@@ -65,13 +81,19 @@ class RegisterController extends State<Register> {
   }
 
   Future<void> register() async {
+    setState(() => confirmPasswordError = null);
+
     if (emailController.text.isEmpty) {
       setState(() => emailError = L10n.of(context)!.register_requiredField);
       return;
     } else {
       setState(() => emailError = null);
     }
 
+    if (!_validateEmail(emailController.text)) {
+      return;
+    }
+
     if (passwordController.text.isEmpty) {
       setState(() => passwordError = L10n.of(context)!.register_requiredField);
       return;