[issue10328] re.sub[n] doesn't seem to handle /Z replacements correctly in all cases

[Matthew Barnett]

Matthew Barnett <python at mrabarnett.plus.com> added the comment:

It's a bug caused by trying to avoid getting stuck when a zero-width match is found. Basically the fix is to advance one character after a zero-width match, but that doesn't always give the correct result.

There are a number of related issues like issue #1647489 ("zero-length match confuses re.finditer()").

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<http://bugs.python.org/issue10328>
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