Why This expression accepting & symbol

Question

I have this regex expression but it accepting & symbol.

string REGEX_ALPHANUMERIC_UNDERSCORE_NOSPACE = "^[a-zA-Z0-9_-,!.]+$";

I am not getting why it is accepting & symbol. Please help anyone Thanks

Answer 1

Try like this

string REGEX_ALPHANUMERIC_UNDERSCORE_NOSPACE = "^[a-zA-Z0-9_\\-,!.]+$";