[issue14460] In re's positive lookbehind assertion repetition works

[Matthew Barnett]

Matthew Barnett added the comment:

Lookarounds can contain capture groups:

>>> import re
>>> re.search(r'a(?=(.))', 'ab').groups()
('b',)
>>> re.search(r'(?<=(.))b', 'ab').groups()
('a',)

so lookarounds that are optional or can have no repeats might have a use.

I'm not sure whether it's useful to repeat them more than once, but that's another matter.

I'd say that it's not a bug.

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<http://bugs.python.org/issue14460>
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