Xây dựng method email Ricycle 1.3

private function email($value) {
    if (preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/", $value)) {
      return true;
    } else {
      return false;
    }
  }