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

>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

Empty variable is the same as undefined:

    set acl_m_temp = ${if match{$h_Subject:}{<regex>}{$1}}
    condition = ${if def:acl_m_temp}
    ...

Note, use acl_m_... for that, one connection can transfer
multiple unrelated messages, once acl_c_... will be set,
it can remain in that state for other messages in the
same connection (while not in this case, but anyway).
The acl_m_... will be cleared for every message for you
by exim itself.

regards


-- 
Slavko
https://www.slavino.sk/