[exim] Re: Show regex capture group in logs?

On Tue, 16 May 2023, MRob via 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
>
> PS: is there better local variable to use?

Since it is just conditional logging of a header
would a system filter be the place for this ?

-- 
Andrew C. Aitchison                      Kendal, UK
                    andrew@???

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