https://bugs.exim.org/show_bug.cgi?id=1786
Philip Hazel <ph10@???> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Philip Hazel <ph10@???> ---
Your pattern uses \C in UTF-8 mode. This is documented as being not a good
idea. This is what the documentation (man pcre2pattern) says:
Because \C breaks up characters into individual code units, matching one unit
with \C in UTF-8 or UTF-16 mode means that the rest of the string may start
with a malformed UTF character. This has undefined results, because PCRE2
assumes that it is matching character by character in a valid UTF string (by
default it checks the subject string's validity at the start of processing
unless the PCRE2_NO_UTF_CHECK option is used).
An application can lock out the use of \C by setting the
PCRE2_NEVER_BACKSLASH_C option when compiling a pattern. It is also possible to
build PCRE2 with the use of \C permanently disabled.
I suggest that you use PCRE2_NEVER_BACKSLASH_C when generating random patterns
using a fuzzer.
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