embed youtube not working /dropping error

What is not working correctly in this embed youtube code below? Idea is that link for a youtube video is inserted from admin panel and then it should be displayed on main page. But it is showing error, the code is:

public function getDescription()
    {
        $description = $this->{'description_' . app()->getLocale()};
        $description = preg_replace('/<figure class="media"><oembed url="https:\/\/youtu.be\/(.*?)"><\/oembed><\/figure>/', '<iframe width="560" height="315" src="https://www.youtube.com/embed/" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>', $description);

        return $description;