[issue27364] Deprecate invalid unicode escape sequences

[Antti Haapala]

Antti Haapala added the comment:

it is handy to be able to use `\w` and `\d` in non-raw-string *regular expressions*, without too much backslashitis. Seems to be in use in Python standard library as well, for example in csv.py

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nosy: +ztane

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27364>
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