anissah/user/plugins/youtube/shortcodes/YoutubeShortcode.php

<?php
namespace Grav\Plugin\Shortcodes;

use Thunder\Shortcode\Shortcode\ShortcodeInterface;

class YoutubeShortcode extends Shortcode
{
    const YOUTUBE_REGEX = '/(?:https?:\/{2}(?:(?:www.youtube(?:-nocookie)?\.com\/(?:[^\/\n\s]+\/\S+\/|(?:v|e(?:mbed)?)\/|\S*?[?&]v=))|(?:youtu\.be\/)))([a-zA-Z0-9_-]{11})/';

    public function init()
    {
        $this->shortcode->getHandlers()->add('youtube', function(ShortcodeInterface $sc) {

            // Get shortcode content and parameters
            $url = $sc->getContent();
            $params = $sc->getParameters();
            $privacy_mode = $sc->getParameter('privacy_enhanced_mode');

            if ($url) {
                preg_match($this::YOUTUBE_REGEX, $url, $matches);
                $search = $matches[0];

                // double check to make sure we found a valid YouTube video ID
                if (!isset($matches[1])) {
                    return $search;
                }

                /** @var Twig $twig */
                $twig = $this->grav['twig'];

                // build the replacement embed HTML string
                $replace = $twig->processTemplate('partials/youtube.html.twig', array(
                    'player_parameters' => $params,
                    'privacy_enhanced_mode' => $privacy_mode,
                    'video_id' => $matches[1],
                ));

                // do the replacement
                return str_replace($search, $replace, $search);
            }


        });
    }
}