https://bugs.exim.org/show_bug.cgi?id=2182
--- Comment #2 from John Tattarakis <tattarakis@???> ---
Sorry, me again. Further results and info: lookbehinds are also plagued. For
example:
^a(?:(?<=(.))[^c])*c
Matched against the string "abc" produces \1 = "b".
PCRE, Python, and Java regexes all exhibit this behaviour. Perl, Javascript,
and .NET regexes do not. Apparently the big implementations are completely
divided on how to handle this situation.
I would argue this is a bug rather than a difference of opinion given the
following result as compared to the above example:
^a(?:(?<=(.))[^b])*b
Now this matched against the string "abc" doesn't set \1. This seems
inconsistent with the earlier result.
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