[issue11957] re.sub confusion between count and flags args

[Valentina Mukhamedzhanova]

Valentina Mukhamedzhanova added the comment:

Please see my patch, I have changed flags to be instances of IntEnum and added a check to re.sub, re.subn and re.split. The patch contains some tests. This solution also allowed me to discover several bugs in the standard library, and I am going to create tickets for them shortly.

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nosy: +umi
Added file: http://bugs.python.org/file30801/patch_11957

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