This seems to do the trick: 
$content =~ s{(foo.*?bar)}{
    my $s = $1;
    $s =~ s{\Q$orig_zimzam\E}{$rep_zimzam};
    $s;
}sge;

[download]

Dave.

In reply to Re: Substitution with matching nested boundary conditions by dave_the_m
in thread Substitution with matching nested boundary conditions by redhotpenguin

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