[issue1647489] zero-length match confuses re.finditer()

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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keywords: +patch
pull_requests: +4404
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue1647489>
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