[exim] Show regex capture group in logs?

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ThreadAuthorDate ()
M+-+\MRob
||.|MJeremy Harris
||.MSlavko
|M\|Andrew C Aitchison
||M|Jeremy Harris
||.M\MRob
|M.||MRob
||.|MJeremy Harris
||.MSlavko
|MAndrew C Aitchison
MJasen Betts