If you want to register a regular expression match or a "." character in front of it cannot be registered.

You cannot register username: "^ \ w + $" after a regular expression match or ".." before it, // It is used for user registration. Match the string username1 consisting of digits, 26 English letters, or underscores: "^ (\ w +) | ([\ u4E00-\ u9FA5 \ uF900-after or before the registration regex match) "cannot be registered

Username: "^ \ w + $", // used for user registration. Match a string consisting of digits, 26 English letters, or underscores

Username1: "^ (\ w +) | ([\ u4E00-\ u9FA5 \ uF900-\ uFA2D] +) $", // used for user registration, supports Chinese characters

If you want to register a regular expression matching followed by or with "...", you cannot register and share: More