Custom rule Laravel Livewire

In Laravel Livewire I added a custom youtube video validation rule. It works very well, the problem is that I need it to be nullable and if I add in the validate nullable it gives me an error and I can't find how to solve this problem.

Input:

<input wire:model="video" class="form-control" type="text" placeholder="Url youtube">

Rule:

 public function passes($attribute, $value)
        {
            return (bool) preg_match('/^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=|\?v=)([^#\&\?]*).*/',$value);
        }

Validate:

'video' => 'nullable', new RuleYoutube,

Removing nullable works fine, but the field is not required. And with the nullable property I get the following error:

No property found for validation: [0]

Any suggestion? Thank you very much for spending time in my consultation

The way I solved this issue was to utilise Livewire's validateOnly method with an invokable validation Rule.

public function updated($propertyName)
{
    if($propertyName == 'enquiry.contact_email'){
        $this->validateOnly('enquiry.contact_email', [
            'enquiry.contact_email' => [new DelimitedEmail, 'required']
        ]);
    }
}

Invokable rule: php artisan make:rule DelimitedEmail --invokable

Code:

class DelimitedEmail implements InvokableRule
{
    public function __invoke($attribute, $value, $fail)
    {
        $func = function(string $value): string {
            return trim($value);
        };
        if(str_contains($value, ',')) {
            $emails = array_map($func,explode(',',$value));
            foreach($emails as $email) {
                if(!filter_var($email, FILTER_VALIDATE_EMAIL)) $fail('This field has an invalid email address.');
            }
        } else {
            if(!filter_var($value, FILTER_VALIDATE_EMAIL)) $fail('That is an invalid email address.');
        }
    }
}