No extractors matching %r found

Raise code

extractors = gen_extractors()

        rex = re.compile(extractor_id, flags=re.IGNORECASE)
        matching_extractors = [
            e for e in all_extractors if rex.search(e.IE_NAME)]

        if len(matching_extractors) == 0:
            raise ExtractorError(
                'No extractors matching %r found' % extractor_id,
                expected=True)
        elif len(matching_extractors) > 1:
            # Is it obvious which one to pick?
            try:
                extractor = next(
                    ie for ie in matching_extractors