[issue43862] warnings: -W option and PYTHONWARNINGS now use the message as a regex

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

> Sadly, the current -W option documentation is wrong :-( I started by writing PR 25439 to fix the documentation, before changing its behavior.

Hum, "wrong" may be too strong. I would say that it is at least misleading.

It starts with "file:line: category: message". I understood that it was the format the option, whereas it is not. Moreover, the full format is simply... not documented at all! Only the short -Waction format :-(

https://docs.python.org/dev/using/cmdline.html#cmdoption-W

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