On 2023-05-16, MRob via Exim-users <exim-users@???> wrote:
> Hi, I want to capture part of a regex match (capture group) to put in
> logs. This example using subject header works but is there a better way?
>
> warn set acl_c_temp = ${if match{$h_Subject:}{<regex with capture
> group>}{$1}{none}}
> !condition = ${if eq{$acl_c_temp}{none}}
> logwrite = Notice: subject match is: $acl_c_temp
>
> This also risky because must be careful to make sure "none" could never
> come from the regex match group
probably better is
warn
set acl_m0 = ${if match{$h_Subject:}{<regex with capture group>}{1$1}{0}}
# if it matched acl_m0 starts with "1" else with "0"
condition = ${length_1:$acl_m0}
# condition understands "1" and "0" so no need for "${if..."
logwrite = Notice: subject match is: ${substr_1:$acl_m0}
# need to chop off the first charcter for printing.
> PS: is there better local variable to use?
I usually use an acl_m variable in message context, and if it's of
temporary use I use a numbered variable, but that's just a convention
I have adopted.
--
Jasen.
🇺🇦 Слава Україні
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