Matthew Barnett <pyt...@mrabarnett.plus.com> added the comment:
The pattern:
\b|:+
will match a word boundary (zero-width) before colons, so if there's a word
followed by colons, finditer will find the boundary and then the colons. You
_can_ get a zero-width match (ZWM) joined to the start of a nonzero-width match
(NWM). That's not really surprising.
If you wanted to avoid a ZWM joined to either end of a NWM, you'd need to keep
looking for another match at a position even after you'd already found a match
if what you'd found was zero-width. That would also affect re.search and
re.match.
For regex on Python 3.7, I'm going with avoiding a ZWM joined to the end of a
NWM, unless re's going a different way, in which case I have more work to do to
remain compatible! The change I did for Python 3.7+ was trivial.
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<https://bugs.python.org/issue25054>
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