Matthew Barnett <pyt...@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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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue10328>
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