static public function verify_username($value)
    {
        if (is_numeric($value)) {
            return true;
        } elseif (static::verify_email($value) ) {
            return true;
        } else {
            $regex = "^[a-z0-9\!\@\#\$\%\&\*\_\-\=]+$";
            return static::verify_regex($regex, $value, 'i');
        }
    }