def METHOD_NAME(webpage):
    return [
        mobj.group('url')
        for mobj in re.finditer(
            r'<iframe\b[^>]+\bsrc=(["\'])(?P<url>(?:https?:)?//(?:%s)/embed-[0-9a-zA-Z]+.*?)\1'
            % '|'.join(site for site in list(zip(*XFileShareIE._SITES))[0]),
            webpage)]