Fix cannot auto create tag when paste list email and switch focus

Signed-off-by: dab246 <tdvu@linagora.com>

core/lib/utils/string_convert.dart

@@ -6,7 +6,7 @@ import 'package:core/domain/exceptions/string_exception.dart';
 import 'package:http_parser/http_parser.dart';
 
 class StringConvert {
-  static const String separatorPattern = r'[ ,;]+';
+  static const String emailSeparatorPattern = r'[,;]+';
 
   static String? writeEmptyToNull(String text) {
     if (text.isEmpty) return null;
@@ -26,23 +26,28 @@ class StringConvert {
     }
   }
 
-  static List<String> extractStrings(String input) {
+  static List<String> extractStrings(String input, String separatorPattern) {
     try {
       // Check if the input is URL encoded
       if (input.contains('%')) {
         input = Uri.decodeComponent(input); // Decode URL encoding
       }
 
-      // Check if the input is Base64 encoded
-      if (input.length % 4 == 0 && RegExp(r'^[A-Za-z0-9+/=]+$').hasMatch(input)) {
-        input = utf8.decode(base64.decode(input)); // Decode Base64 encoding
+      // Efficient Base64 validation: Check length and minimal regex match
+      if (input.length % 4 == 0 && input.contains(RegExp(r'^[A-Za-z0-9+/=]+$'))) {
+        try {
+          input = utf8.decode(base64.decode(input)); // Decode Base64 encoding
+        } catch (_) {
+          // Ignore if decoding fails
+        }
       }
 
       final RegExp separator = RegExp(separatorPattern);
       final listStrings = input
           .replaceAll('\n', ' ')
           .split(separator)
-          .where((value) => value.trim().isNotEmpty)
+          .map((value) => value.trim())
+          .where((value) => value.isNotEmpty)
           .toList();
       log('StringConvert::extractStrings:listStrings = $listStrings');
       return listStrings;
@@ -51,6 +56,9 @@ class StringConvert {
     }
   }
 
+  static List<String> extractEmailAddress(String input) =>
+      extractStrings(input, emailSeparatorPattern);
+
   static String decodeFromBytes(
     Uint8List bytes, {
     required String? charset,