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

[Matthew Barnett]

Changes by Matthew Barnett <python at mrabarnett.plus.com>:


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nosy: +mrabarnett

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