https://bugs.exim.org/show_bug.cgi?id=2305
--- Comment #4 from Philip Hazel <ph10@???> ---
I see. Experiments with Perl indicate that the mere presence of \N{U+xxx} turns
on Unicode interpretation for the whole pattern. So changing \x{41} into
\N{U+41} for example is more than just a change of notation.
PCRE2 cannot do this. It operates in one of two modes: EITHER input is UTF and
case handling is per Unicode rules, OR input is not UTF and case handling is
locale dependent. Whichever is controlled by the PCRE2_UTF flag, set at the
start of processing.
So, the only thing I can do, and will do, is to make \N{U+xxx} give an error if
encountered in non-Unicode (non-UTF) mode.
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