[issue12731] python lib re uses obsolete sense of \w in full violation of UTS#18 RL1.2a

[Antoine Pitrou]

Change by Antoine Pitrou <pitrou at free.fr>:


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stage: test needed -> needs patch
versions: +Python 3.11 -Python 3.6, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue12731>
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