[issue40016] Clarify flag case in `re` module

[Serhiy Storchaka]

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

It is very inconvenient to use single-letter lowercase names for constants. It contradicts PEP 8:

https://www.python.org/dev/peps/pep-0008/#constants

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nosy: +serhiy.storchaka

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