Requirement is allowed only letters, Numbers or an underscore (_), the marking (-), at least two characters, must begin with a letter, not end with special characters (_, and -)

Is mainly used for the front-end validation of registration, please hand to help the son

CodePudding user response:

 ^ [a zA - Z] [a zA - Z0-9 - _] * [a - zA - Z0-9] $