$uuid = "1111-1111-1111-1111";
function printResults($str) {
if (eregi("^[0-9a-f]{8}(-[0-9a-f]{4}){3}-[0-9a-f]{12}$", $str)) {
printf("'%s' is a valid GUID/UUID.\n", $str);
} else {
printf("'%s' is NOT a valid GUID/UUID.\n", $str);
}
}
printResults($uuid);
?>