function valid_email_address

Verifies the syntax of the given e-mail address.

See RFC 5322 for details.

Parameters

$mail: A string containing an e-mail address.

Return value

1 if the email address is valid, 0 if it is invalid or empty, and FALSE if there is an input error (such as passing in an array instead of a string).

Related topics

File

includes/common.inc, line 1026

Common functions that many Drupal modules will need to reference.

Code

function valid_email_address($mail) {
  $user = '[a-zA-Z0-9_\\-\\.\\+\\^!#\\$%&*+\\/\\=\\?\\`\\|\\{\\}~\']+';
  $domain = '(?:(?:[a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\\-]*[a-zA-Z0-9])\\.?)+';
  $ipv4 = '[0-9]{1,3}(\\.[0-9]{1,3}){3}';
  $ipv6 = '[0-9a-fA-F]{1,4}(\\:[0-9a-fA-F]{1,4}){7}';
  return preg_match("/^{$user}@({$domain}|(\\[({$ipv4}|{$ipv6})\\]))\$/", $mail);
}