my $target_dir = "/backups/test/";
opendir my $dh, $target_dir or die "can't opendir $target_dir: $!";
while (defined(my $file = readdir($dh))) {
    next if ($file =~ /^\.+$/);
    #Get filename attributes
    if ($file =~ /^foo(\d{3})\.name\.(\w{3})-foo_p(\d{1,4})\.\d+.csv$/) {
      print "$1\n";
      print "$2\n";
      print "$3\n";
    }
    print "$file\n";
}

##</code><code>##

use strict;
use Digest::MD5 qw(md5_hex);
#Create new file
open (NEWFILE, ">/backups/processed/foo$1.name.$2-foo_p$3.out") || die "cannot create file";
my $data = '';
my $line1 = <>;
chomp $line1;
my @heading = split /,/, $line1;
my ($sep1, $sep2, $eorec) = ( "^A", "^E", "^D");
while (<>)
{
    my $digest = md5_hex($data);
    chomp;
    my (@values) = split /,/;
    my $extra = "__mykey__$sep1$digest$sep2" ;
    $extra .= "$heading[$_]$sep1$values[$_]$sep2" for (0..scalar(@values));
    $data .= "$extra$eorec"; 
    print NEWFILE "$data";
}
#print $data;
close (NEWFILE);