https://bugs.exim.org/show_bug.cgi?id=2300
Bug ID: 2300
Summary: character class using \x escape sequence, /i modifier,
and backtracking
Product: PCRE
Version: 8.41
Hardware: x86
OS: Windows
Status: NEW
Severity: bug
Priority: medium
Component: Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
I don't really know what to say, examples will be better.
https://regex101.com/r/KnnzH8/9
pattern: "/^[^\x{100}-\x{ffff}]*[\x80-\xff]/u"
text: "a é"
This should match but does not.
If you add the /i modifier, it does match
If you add a character at the end of the first character class (\n) (without
/i) it matches:
^[^\x{100}-\x{ffff}\n]*[\x80-\xff]
I've been testing this on mIRC, the irc client, which uses pcre 8.41, I don't
know which version is used by the website.
On the website, there is a debugger for pcre, it shows that pcre backtracks in
a weird way when the bug occurs.
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