Grav\Plugin\AdminPlugin::validate PHP Method

    protected function validate($type, $value, $extra = '')
    {
        switch ($type) {
            case 'username_format':
                if (!preg_match('/^[a-z0-9_-]{3,16}$/', $value)) {
                    return false;
                }
                return true;
            case 'password1':
                if (!preg_match('/(?=.*\\d)(?=.*[a-z])(?=.*[A-Z]).{8,}/', $value)) {
                    return false;
                }
                return true;
            case 'password2':
                if (strcmp($value, $extra)) {
                    return false;
                }
                return true;
        }
        return false;
    }