matching_extractors = [e for e in gen_extractor_classes() if rex.search(e.IE_NAME)]
if len(matching_extractors) == 0:
- raise ExtractorError('No extractors matching {extractor_id!r} found', expected=True)
+ raise ExtractorError(f'No extractors matching {extractor_id!r} found', expected=True)
elif len(matching_extractors) > 1:
try: # Check for exact match
extractor = next(