[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:

Just as a comparison, sed does the 3.6 thing:

> echo foo | sed 's/\(.*\)/x\1y/g'
xfooy

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