[issue31714] Improve re documentation

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:


New changeset cd195e2a7ac5c9b2574d5462752b7939641de4a9 by Serhiy Storchaka in branch 'master':
bpo-31714: Improved regular expression documentation. (#3907)
https://github.com/python/cpython/commit/cd195e2a7ac5c9b2574d5462752b7939641de4a9


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