https://bugs.exim.org/show_bug.cgi?id=2792
--- Comment #1 from Philip Hazel <Philip.Hazel@???> ---
Perl used to allow \K in lookarounds. I am aware that it has changed, and this
is documented in pcre2pattern:
"Perl used to document that the use of \K within lookaround assertions is "not
well defined", but from version 5.32.0 Perl does not support this usage at all.
In PCRE2, \K is acted upon when it occurs inside positive assertions, but is
ignored in negative assertions."
I suspect that changing PCRE2 will break a few patterns and annoy some people
without achieving very much, so I am not very keen on making a change, except
perhaps to give an error instead of ignoring \K in negative lookarounds.
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