Overtrue\Validation\Factory::addExtensions PHP Method

    protected function addExtensions(Validator $validator)
    {
        $validator->addExtensions($this->extensions);
        // Next, we will add the implicit extensions, which are similar to the required
        // and accepted rule in that they are run even if the attributes is not in a
        // array of data that is given to a validator instances via instantiation.
        $implicit = $this->implicitExtensions;
        $validator->addImplicitExtensions($implicit);
        $validator->addReplacers($this->replacers);
        $validator->setFallbackMessages($this->fallbackMessages);
    }