https://bugs.exim.org/show_bug.cgi?id=2399
--- Comment #1 from Philip Hazel <ph10@???> ---
The string you quote is not, as far as I can see, a valid UTF string. I do not
know how PHP calls PCRE2, nor how it interprets the escaped values in your
string. I suspect it is somehow calling pcre2_match() with an invalid UTF
string and the PCRE2_NO_UTF_CHECK option. This is documented to cause undefined
behaviour. Is PHP an 8-bit or a 16-bit system? Can you find out exactly what
byte or 16-bit values are in the string? Then I can try to test it with
pcre2test just to be sure.
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