Updating the Password Policy in Laravel 5.x's AuthController.php file

AuthController.php

protected function validator(array $data)
{
    return Validator::make($data, [
        'name' => 'required|max:255',
        'email' => 'required|email|max:255|unique:users',
        'password' => 'required|confirmed|min:8|regex:/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^a-zA-Z0-9]).+$/',
    ], [
        'password.regex' => 'Password must contain at least 1 lower-case and capital letter, a number and symbol.'
    ]);
}