Return type annotations for methods `Match.group()` should reflect the fact that `None` can be returned, see https://docs.python.org/3/library/re.html#re.Match.group. https://github.com/python/typeshed/blob/0dea39cb3c07f04abe5b15491e4bd62ce3e6739c/stdlib/3/typing.pyi#L529
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