https://bugs.exim.org/show_bug.cgi?id=2124
--- Comment #1 from Philip Hazel <ph10@???> ---
In order to try to reproduce this with pcre2test, I need to know what the
subject line is that was being matched against that regex, and whether it is
expected to match. It may be that you just have a very large search tree that
is taking a very long time to search. This is the most common cause of reports
of "looping".
On the other hand, your regex doesn't look pathological at first sight.
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