cookies_addons-1.0.3/modules/cookies_addons_embed_video/cookies_addons_embed_video.module

<?php

/**
 * @file
 * Primary module hooks for Cookies Addons embed video module.
 */

/**
 * Check if the src attribute is a YouTube iframe.
 *
 * @param string $src
 *   The string from the src attribute.
 *
 * @return bool
 *   TRUE if this is a YouTube url.
 */
function _cookies_addons_embed_video_is_youtube(string $src) {
  preg_match_all(
    '/(?:https?:)?(?:\/\/)?(?:[0-9A-Z-]+\.)?(?:youtu\.be\/|youtube(?:-nocookie)?\.com\/\S*?[^\w\s-])((?!videoseries)[\w-]{11})(?=[^\w-]|$)(?![?=&+%\w.-]*(?:[\'"][^<>]*>|<\/a>))[?=&+%\w.-]*/im',
    htmlspecialchars_decode($src),
    $matches
  );

  return isset($matches[0][0]);
}