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Postings from July 2018
This is a good test case for the bug:
On the other hand, my patch does allow this example to match:
print "matched\n" if "ABCDA" =~ /^ (?: (.)B | CD )* \1 $/x;
Without my patch, this matches instead:
print "matched\n" if "ABCDC" =~ /^ (?: (.)B | CD )* \1 $/x;
The bug appears to be the result of an optimization of describing the
capture buffer with an offset -- essentially a dynamic substring expression
-- rather than copying the captured string into it.
Were the capture buffer to be copied into, it would get 'A' (the character
before the B) rather than 'C ' (the first character in the match) and the
behavior would be the same as what the other regex engines do.
Is that what the patch changes?
--
"At this point, given the limited available data, certainty about only a
very small number of things can be achieved." -- Plato, and others
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