simonbowen

$postcode = 'IP13SU';
$pattern = "/^(GIR 0AA)|((([A-Z-[QVX]][0-9][0-9]?)|(([A-Z-[QVX]][A-Z-[IJZ]][0-9][0-9]?)|(([A-Z-[QVX]][0-9][A-HJKSTUW])|([A-Z-[QVX]][A-Z-[IJZ]][0-9][ABEHMNPRVWXY]))))[0-9][A-Z-[CIKMOV]]{2})$/";
return (boolean) preg_match($pattern, $postcode);