bpo-34624: Allow regex for module passed via -W or PYTHONWARNINGS

[coldfix]

Enables passing in regexes for the module part via -W or PYTHONWARNINGS as implied it should be possible by the documentation.

https://bugs.python.org/issue34624

The same should should probably be done for the message part as this is implied to work as regex as well.

https://bugs.python.org/issue34624

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