https://bugs.exim.org/show_bug.cgi?id=2555
--- Comment #4 from Philip Hazel <ph10@???> ---
The input to pcre2test is always 8-bit. If the utf option is set, that pattern
and its test data are interpreted as UTF-8 characters. If you set the -16 or
-32 options, the characters that are defined in UTF-8 are converted to UTF-16
or UTF-32 before being passed to the relevant PCRE2 library. Thus, the same
input works for all 3 libraries.
This particular pattern fails fast in 8-bit mode because it is too big. If you
compile --with-link-size=3 the 8-bit pattern behaves in the same way as the 16-
and 32-bit patterns - that is, it is accepted but JIT takes a long time.
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