fix: extract podcast ids from user groups using a regex

        $userPodcastIds = [];

        // extract all podcast ids from groups

        foreach ($podcastGroups as $podcastGroup) {

            $userPodcastIds[] = substr((string) $podcastGroup, strpos((string) $podcastGroup, '#') + 1, 1);

            // extract podcast id from group and add it to the list of ids

            preg_match('~podcast#([0-9]+)-[a-z]+~', $podcastGroup, $matches);

            $userPodcastIds[] = $matches[1];

        }

        return $userPodcastIds;