[pypy-issue] [issue923] Regular expressions with optional look-ahead operations failing to match groups

[Bruno Gola]

Bruno Gola <brunogola at gmail.com> added the comment:

More information on this, I simplified the test case and did some debug. The 
regexps bytecode are the same on both PyPy and CPython.

PyPy 1.6:
>>>> re.compile("1(?=(1))?").match("11").groups() # Using the '?' operator on 
the whole assert/look-ahead block fails
(None,)
>>>> re.compile("1(?=(1)?)").match("11").groups() # Using the '?' operator just 
on the subpattern
('1',)

CPython 2.7
>>> re.compile("1(?=(1))?").match("11").groups()
('1',)
>>> re.compile("1(?=(1)?)").match("11").groups()
('1',)

----------
status: unread -> chatting
title: Regular expressions with optional look-ahead operations failing to match -> Regular expressions with optional look-ahead operations failing to match groups

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PyPy bug tracker <tracker at bugs.pypy.org>
<https://bugs.pypy.org/issue923>
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