Josh Rosenberg added the comment:
Presumably something like:
r'(?:' + r'|'.join({re.escape(os.path.sep), re.escape(os.path.altsep)}) + r')'
would cover it completely. I switched to using non-capturing groups over a
character class both to deal with the fact that escaping doesn't work the same
way for character classes and to cover the possibility (no idea here) that some
terrible OS might have a multicharacter path separator.
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nosy: +josh.r
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<http://bugs.python.org/issue28718>
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