https://bugs.exim.org/show_bug.cgi?id=2323
--- Comment #4 from Arran Cudbard-Bell <a.cudbardb@???> ---
Confirmed this works as expected. Only slight concern is that the subject
field is left pointing to the original subject string if the match failed (as
opposed to being set to NULL). Hopefully none of the other functions attempt
to dereference subject if there are no matches.
--
(lldb) p ret
(int) $0 = 8
(lldb) p subject
(const char *) $2 = 0x000060b00005be80 "1_2_3_4_5_6_7"
(lldb) p (char *)(((uintptr_t *)(regmatch->match_data))[4])
(char *) $1 = 0x000060b00005e030 "1_2_3_4_5_6_7"
(lldb) p ret
(int) $15 = -1
(lldb) p subject
(const char *) $8 = 0x000060b00005cb90 "ABCDEF_8"
(lldb) p (char *)(((uintptr_t *)(regmatch->match_data))[4])
(char *) $14 = 0x000060b00005cb90 "ABCDEF_8"
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