Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

It is correct and documented behavior. ".*" matches two substrings: the whole 
string "bc" and an empty string at the end of the string.

See https://docs.python.org/3/library/re.html#re.sub and 
https://docs.python.org/3/whatsnew/3.7.html#changes-in-the-python-api.

The behavior before 3.7 was incorrect.

----------
nosy: +serhiy.storchaka
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue39687>
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