https://bugs.exim.org/show_bug.cgi?id=2792
--- Comment #2 from firas <firas.dib@???> ---
Thanks for the reply.
I stumbled upon this due to the following regex by a user:
https://regex101.com/r/7PPxPD/1/
This results in an infinite loop, even in other implementations such as PHP:
https://3v4l.org/F4NhG
It also produces some errors (-60) when used in substitution mode in PCRE2.
I understand your reasoning, and think either is fine. I will probably proceed
with producing an error on regex101 when \K is placed in a lookaround, to avoid
some of these edge cases.
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