[issue12231] regrtest: add -k and -K options to filter tests by function/file names

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

This patch doesn't work if run_unittest() is called with an already constructed test suite or test case (the patch in #12626 does).

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nosy: +pitrou

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<http://bugs.python.org/issue12231>
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