[docs] [issue36645] re.sub() library entry does not adequately document surprising change in behavior between versions

[Josh Rosenberg]

Josh Rosenberg <shadowranger+python at gmail.com> added the comment:

I believe the second note under "Changed in 3.7" is intended to address this:

> Empty matches for the pattern are replaced when adjacent to a previous non-empty match.

Obviously not as detailed as the What's New entry, but it's there.

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nosy: +josh.r

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