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http://bugs.exim.org/show_bug.cgi?id=1467
--- Comment #4 from Zoltan Herczeg <hzmester@???> 2014-04-21 14:22:50 ---
Hi Graycode,
I did not fully investigated the issue, but here some analysis:
This cause an "infinite" loop: "\".?(.|a){1025}$"
This is not however: "\".(.|a){1025}$" (no match)
(I suspect we fail the minimum length check)
Again, this is not: "\"(.|a){1025}$" (a match)
(We reach the end)
Again, this is not: "\".?(.|\\x00){1025}$" (a match)
(there is no 0x0 character in the input, but there is a lot of 'a')
I don't think the loop itself is infinite, just 2^1025 is a really big number.
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