Improper validation of unicode characters

Hi, I just saw a report of #229483 This issue still persist. When i tried some Unicode characters like smilies etc. It is working perfectly by displaying the Error message on the same page that **Username may only contain letters, numbers or the following characters: @ . + - _** See 1.jpg for smilies handling (Expected) See 2.jpg for other Unicode characters (Not handled correctly) But when i put some other unicode charachters like 👨‍👩‍👧‍👦 1. Copy this 👨‍👩‍👧‍👦 2. Put in the username field and save. 3. Following Error will be displayed. It still showing the same error as in previous report. ``` Server Error The server had serious problems while serving your request. We've just sent our trained monkeys to fix the issue. ``` Please check. Thanks, Akash Saxena