[PHP] Extract YouTube Code from a given URL

<?php
namespace In2code\In2template\Migration\Utility;

/**
 * Class StringUtility
 */
class StringUtility
{

    /**
     * Parse every kind of Youtube URI and return video code
     *
     *  Example URI:
     *      <a href="http://www.youtube.com/embed/6FjfewWAGdE?feature=player_detailpage" target="_blank" rel="noreferrer">www.youtube.com/embed/6FjfewWAGdE</a>
     *      <a href="http://www.youtube.com/embed/6FjfewWAGdE?feature=player_detailpage" target="_blank" rel="noreferrer">www.youtube.com/embed/6FjfewWAGdE</a>
     *      <a href="https://www.youtube.com/embed/6FjfewWAGdE" target="_blank" rel="noreferrer">www.youtube.com/embed/6FjfewWAGdE</a>
     *      <a href="https://youtube.com/embed/6FjfewWAGdE" target="_blank" rel="noreferrer">youtube.com/embed/6FjfewWAGdE</a>
     *      <a href="https://www.youtube-nocookie.com/embed/6FjfewWAGdE" target="_blank" rel="noreferrer">www.youtube-nocookie.com/embed/6FjfewWAGdE</a>
     *      <a href="http://www.youtube.com/watch?v=6FjfewWAGdE" target="_blank" rel="noreferrer">www.youtube.com/watch</a>
     *      <a href="http://www.youtube.com/watch?v=6FjfewWAGdE&amp;feature=player_detailpage" target="_blank" rel="noreferrer">www.youtube.com/watch</a>
     *      www.youtu.be/6FjfewWAGdE
     *      youtu.be/6FjfewWAGdE
     *      youtube.com/watch?v=6FjfewWAGdE
     *      <a href="https://www.youtube.com/watch?v=6FjfewWAGdE&amp;feature=youtu.be" target="_blank" rel="noreferrer">www.youtube.com/watch</a>
     *
     * @param string $uri
     * @return string
     */
    public static function getYoutubeCodeFromUri(string $uri): string
    {
        $code = '';
        $regExp = '~^(http://|https://|.*?)(www.|.*?)(youtube.com|youtu.be|youtube-nocookie.com)/(embed/|watch\?v=|.*?)(.*?)(\?|\&|$)~';
        preg_match($regExp, $uri, $result);
        if (!empty($result[5])) {
            $code = $result[5];
        }
        return $code;
    }
}