Api\StarterKit\Providers\ApiStarterKitServiceProvider::registerValidator PHP Method

    private function registerValidator()
    {
        Validator::extend('phone', function ($attribute, $value, $parameters) {
            return preg_match("/^1[0-9]{2}[0-9]{8}\$|15[0189]{1}[0-9]{8}\$|189[0-9]{8}\$/", $value);
        });
    }