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

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> Attached patch adds -k/--func-regex and -K/--file-regex options to filter
> tests by function/file names.

We need maybe a third option to filter tests by their class name. And we need 
also maybe the opposite option: exclude tests matching a regex. Another 
proposition: --include and --exclude options using the following format:

<file regex>:<class regex>:<function regex>

Each field is optional, examples:

--include "test_subprocess::leak" ignores test_leak function of 
test_subprocess file
--include "codecencoding::" runs the 6 test_codecencoding* files
--include "test_subprocess:^C:" runs only the tests of the io module (not the 
_pyio module)
- etc.

Problem: --exclude (-x) option is already used.

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