[issue41555] re.sub replaces twice

[Ma Lin]

Ma Lin <malincns at 163.com> added the comment:

The re.sub() doc said:
Changed in version 3.7: Empty matches for the pattern are replaced when adjacent to a previous non-empty match.

IMO 3.7+ behavior is more reasonable, and it fixed a bug, see issue25054.

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nosy: +malin

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