How to check for special characters using regex

Question

NET. I have created a regex validator to check for special characters means I donot want any special characters in username. The following is the code

Regex         


        

Answer 1

Your pattern checks only if the given string contains any "non-special" character; it does not exclude the unwanted characters. You want to change two things; make it check that the whole string contains only allowed characters, and also make it check for more than one character:

^[a-zA-Z0-9_@.-]+$

Added ^ before the pattern to make it start matching at the beginning of the string. Also added +$ after, + to ensure that there is at least one character in the string, and $ to make sure that the string is matched to the end.