Ezio Melotti <ezio.melo...@gmail.com> added the comment:
This behavior was changed in 3.7: "Empty matches for the pattern are replaced
only when not adjacent to a previous empty match, so sub('x*', '-', 'abxd')
returns '-a-b--d-'." [0]
See also bpo-32308 and bpo-25054.
[0]: https://docs.python.org/3/library/re.html#re.sub
----------
resolution: -> not a bug
stage: -> resolved
status: open -> closed
superseder: -> Replace empty matches adjacent to a previous non-empty match in
re.sub()
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41080>
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