webpage = self._download_webpage(url, display_id)
play_url = self._search_regex(
- r'<iframe[^>]+src=(["\'])(?P<url>%s?(?:(?!\1).)*)\1' % LcpPlayIE._VALID_URL,
+ rf'<iframe[^>]+src=(["\'])(?P<url>{LcpPlayIE._VALID_URL}?(?:(?!\1).)*)\1',
webpage, 'play iframe', default=None, group='url')
if not play_url: