Naja, die reg_ex für validate_email ist dann doch ziemlich komplex
[php:1:ebf31f5b4e] /**
* FUNCTION: validateEmail
*
* Validates an email address and return true or false.
*
* @param string $address email address
* @return bool true/false
* @access public
*/
function validateEmail ($address) {
return preg_match('/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9_-]+(\.[_a-z0-9-]+)+$/i',$address);
}[/php:1:ebf31f5b4e]