Same name and namespace in other branches
  1. 4.6.x includes/common.inc \valid_email_address()
  2. 4.7.x includes/common.inc \valid_email_address()
  3. 6.x includes/common.inc \valid_email_address()
  4. 7.x includes/common.inc \valid_email_address()
  5. 8.9.x core/includes/common.inc \valid_email_address()

Verify the syntax of the given e-mail address.

Empty e-mail addresses are allowed. See RFC 2822 for details.

Parameters

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

Return value

TRUE if the address is in a valid format.

Related topics

File

includes/common.inc, line 909
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);
}