https://bugs.exim.org/show_bug.cgi?id=2232
--- Comment #1 from Philip Hazel <ph10@???> ---
I have analysed this issue: the bug is that, when the newline is present, the
optimizing code is incorrectly auto-possessifying the a? item. Another
workaround is to set the PCRE2_NO_AUTO_POSSESS option, but of course that will
also suppress legitimate auto-possessification. I will look at this some more;
if there is a trivial fix I might be able to slip it into the forthcoming 10.31
release, for which a Release Candidate is currently under testing. However, if
the fix is anything other than very small, this will have to wait until the
following release.
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