Hi. Need help in solving a form validation using regex.

My code is as follows. When submitting the form, an error occurs: preg_match(): No ending delimiter '/' found on line....

On the website https://regex101.com/r/iB4tK1/1 code (+7|8)((\d{3})|\d{3})\d{7}$ everything works good.

Where I missed the delimiter '/'?

My code:

    $validator = Validator::make(
            [
                'name' => $name,
                'phone' => $phone,
            ],
            [
                'name' => 'required|alpha|min:2',
                'phone' => 'required|regex:/(\+7|8)(\(\d{3}\)|\d{3})\d{7}$/',
            ],
            [
                'required' => 'Пожалуйста, представьтесь.',
                'min' => 'Введите свое настоящее имя!',
                'alpha' => 'Вводите только буквы A-z А-я!',
                'regex' => 'Введите телефон в формате 8(ххх)ххххххх',
            ]
        );