Unnamed

// Drupal's email checker regexpfunction 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);}