That's not bad. Consider this. I rolled your A-Z/ loop up and then did the substitution on a copy inside the RHS.

$expr =~ s(\[((?:[A-Z/]+)\s){4,4})\]){
    my $match = $_;
    $match =~ s([/\s])(_)g;
    $match;
}ge;

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In reply to Re: Re: Re: Substituting in the substitution! by diotalevi
in thread Substituting in the substitution! by Mondongo

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