fix(ui, core): make message input regex caseInsensitive.

Signed-off-by: xsahil03x <[email protected]>

packages/stream_chat_flutter/lib/src/message_input/stream_message_input.dart

@@ -1042,6 +1042,7 @@ class StreamMessageInputState extends State<StreamMessageInput>
   CancelableOperation? _enrichUrlOperation;
   final _urlRegex = RegExp(
     r'(?:(?:https?|ftp):\/\/)?[\w/\-?=%.]+\.[\w/\-?=%.]+',
+    caseSensitive: false,
   );
 
   void _checkContainsUrl(String value, BuildContext context) async {