php - RegEx for Twitter username not working -


the following regular expression function validating twitter username not working because twitter name can minimum of 1 character , maximum of 20. however, when tested this, allows usernames greater 20 characters. did go wrong?

public function val_username($subject) {     return (bool)preg_match('/[a-za-z0-9_]{1,20}/', $subject);       }

you forgot $ , ^

/^[a-za-z0-9_]{1,20}$/ should work

public function val_username($subject) {     return (bool)preg_match('/^[a-za-z0-9_]{1,20}$/', $subject);       }

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