YoutubeValidationRule

// Make sure to put this at the top of your AppServiceProvider: use Illuminate\Support\Facades\Validator;

Validator::extend('youtube', function ($attribute, $value, $parameters, $validator) {
    preg_match("#(?<=v=)[a-zA-Z0-9-]+(?=&)|(?<=v\/)[^&\n]+(?=\?)|(?<=v=)[^&\n]+|(?<=youtu.be/)[^&\n]+#", $value, $matches);
    return count($matches) > 0;
}, "Sorry, this doesn't look like a valid youtube URL");