match uuid patter laravel regex

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);
});

Validator::extend('location', function ($attribute, $value, $parameters, $validator) {
    return preg_match('/^-?\d{1,2}\.\d{6,}\s*,\s*-?\d{1,2}\.\d{6,}$/', $value);
});