Some other variations:

use strict;
use warnings;
use 5.010;

my $string = "_'nada_komo_el_'sol_";

$string =~  s/_'?(.)/_'$1/g;

say $string;

--output:--
_'nada_'komo_'el_'sol_

[download]

---

use strict;
use warnings;
use 5.010;


my $string = "_'nada_komo_el_'sol_";

my @pieces = split /_'?/, $string;

say join(q{_'}, @pieces);

--output:--
_'nada_'komo_'el_'sol

[download]

In reply to Re: Modifying the match position after each match by 7stud
in thread Modifying the match position after each match by pat_mc

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