Regular Expression checks whether the registered user name is standard. Regular Expression User Name

Regular Expression checks whether the registered user name is standard. Regular Expression User Name

Regex rex = new Regex (@ "[\ u4E00-\ u9FFF]"); var result = rex. match (registReq. userName); if (result. success) {mResp. errorInfo = "the user name cannot be a Chinese character! "; Return true;} Regex rex2 = new Regex (@" ^ \ w $ "); result = rex2.Match (registReq. UserName); if (! Result. Success) {mResp. ErrorInfo = "the user name contains invalid characters! "; Return true ;}

[...] Is a character limitation

^... $ Is to match the entire string

\ W is a letter, digit, underscore, and Chinese character.

That is, the entire string must contain letters, numbers, and underscores (_).