[issue33585] re.sub calls repl function one time too many for catch-all regex

[Ville Skyttä]

Ville Skyttä <ville.skytta at iki.fi> added the comment:

Right, it's not limited to repl functions.

Python 3.6.3:
$ python -c 'import re;print(re.sub(".*", "X", "foo"))'
X

Python 3.7.0b4+:
$ python -c 'import re;print(re.sub(".*", "X", "foo"))'
XX

Poking serhiy.storchaka who according to the release notes, seems to have done quite a bit of work on re in 3.7.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue33585>
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