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Re: Using a regex capture as part of a varible

by soonix (Canon)
on May 07, 2020 at 15:08 UTC ( #11116548=note: print w/replies, xml ) Need Help??


in reply to Using a regex capture as part of a varible

Problem is, here, $1 is interpolated at the call to sed. That means: even before it is known if a match will occur and what will be matched. You could patch your copy of Rex::Commands::File to include /e flags for the two s/// operations in sed, but that is most certainly going to break other things.

In your case, it looks like you don't want to replace, anyway, but to insert. You could try whether turning your search pattern into a lookbehind might work.

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Re^2: Using a regex capture as part of a varible
by nysus (Vicar) on May 07, 2020 at 15:20 UTC

    Yes, good insight. It seems I'm using the wrong tool for the job. I've toyed with lookbehinds and never found a good use case that didn't hurt my brain but this seems like the perfect one.

    $PM = "Perl Monk's";
    $MCF = "Most Clueless Friar Abbot Bishop Pontiff Deacon Curate Priest Vicar";
    $nysus = $PM . ' ' . $MCF;
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