[issue25743] Clarify exactly what \w matches in UNICODE mode

[Zack Weinberg]

Zack Weinberg added the comment:

FWIW, the actual behavior of \w matching "everything in Unicode general categories L* and N*, plus U+005F (underscore)" is consistent across all versions I can conveniently test (2.7, 3.4, 3.5).

In 2.7, there are four characters in general category Nl that \w doesn't match, but I believe that is just a bug, not an intentional difference of behavior.

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