Сопоставьте uuid patter
Validator::extend('uuid', function ($attribute, $value, $parameters, $validator) {
return preg_match('/[a-f0-9]{8}\-[a-f0-9]{4}\-4[a-f0-9]{3}\-(8|9|a|b)[a-f0-9]{3}\-[a-f0-9]{12}/', $value);
});
Said HR