[issue32308] Replace empty matches adjacent to a previous non-empty match in re.sub()

[Anders Hovmöller]

Anders Hovmöller <boxed at killingar.net> added the comment:

This was a really bad idea in my opinion. We just found this and we have no way to know how this will impact production. It's really absurd that 

re.sub('(.*)', r'foo', 'asd')

is "foo" in python 1 to 3.6 but 'foofoo' in python 3.7.

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nosy: +Anders.Hovmöller

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<https://bugs.python.org/issue32308>
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