use 5.010;
use strict;
use warnings;
my $string = "(1,2,3) XXX (1,2,3)";
my $open = -1;
$open = index $string, "(", $open + 1 for 1 .. 2;
my $close = index $string, ")", $open + 1;
substr($string, $open + 1, $close - $open - 1) =~ s/(\d+)/'$1'/g;
say $string;
__END__
(1,2,3) XXX ('1','2','3')
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