function check_email_address($email) { if (!ereg("^[^@]{1,64}@[^@]{1,255}$", $email)) { return false; } $email_array = explode("@", $email); $local_array = explode(".", $email_array[0]); for ($i = 0; $i < sizeof($local_array); $i++) { if(!ereg("^(([A-Za-z0-9!#$%&'*+/=?^_`{|}~-][A-Za-z0-9!#$%&'*+/=?^_`{|}~.-]{0,63})|("[^(|")]{0,62}"))$",$local_array[$i])) { return false; } } if (!ereg("^[?[0-9.]+]?$", $email_array[1])) { $domain_array = explode(".", $email_array[1]); if (sizeof($domain_array) < 2) { return false; } for ($i = 0; $i < sizeof($domain_array); $i++) { if(!ereg("^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|([A-Za-z0-9]+))$",$domain_array[$i])) { return false; } } } return true; }