use strict;
my $string = "testx_testy_testz";
my $in = "(testx)_(testy)_(testz)";

my $out = '2_1::0';

test("$string","$in","$out");

sub test
{
my $sub_string = shift;
my $sub_in = shift;
my $sub_out = shift;

print "$sub_string <=> $sub_in <=> $sub_out \n";

my @info = $sub_string =~ /$sub_in/;

my $new_string = "";
for my $rr ( 0 .. length($sub_out)-1 )
{
    my $ch = substr($sub_out,$rr,1);
    ( $ch =~ /\d/ ) ? $new_string.=$info[$ch] : 1;
    ( $ch =~ /\D/ ) ? $new_string.=$ch : 1;
    
}


print "erg: $new_string \n";
}