Use: $emailAddress = ValidateEmailAddress($emailAddress);

Returns: FALSE if not valid, or lower-cased validated email address

<code lang="php">
function ValidateEmailAddress($EmailAddress){
   $EmailAddress = strtolower(trim($EmailAddress));
   if (!eregi("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$", $EmailAd
dress)){
      return FALSE;
   } else {
      return $EmailAddress;
   }
}
</code>