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This regex bug was actually already known. Please follow up on the other report.
> As an aside, it seems that the failing test from issue 13193 was
> actually correct, and that the library itself was broken.
Yes. filelist operates in this way: it builds a list of all files in a tree (creating allfiles, which thus uses native path separators), then edits this list according to the MANIFEST.in commands (where the patterns must be transformed to a regex that uses native separators). So the test was right in using os.path.join, and the regex was not right to always use '/'.