[docs] [issue12875] backport re.compile flags default value documentation

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

> but can we first get the convention documented somewhere?

+1
This was on my todo list, but feel free to open a new issue about it.

> Grepping through the docs disagrees with your claims 

That's because is not documented and not everyone is aware of the conventions and how/where they should be followed.

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