Hi, ranceh

Am using v5.16, but there's nothing in the code that would prevent its execution by much earlier versions, so I suspect the issue is something else. Try the following change to the subroutine:

use strict;
use warnings;

my $directory = './zones';
my %zones     = getZoneHash($directory);

print "$_ -> $zones{$_}\n" for keys %zones;

sub getZoneHash {
    my ($dir) = @_;
    my %hash;

    my @files = grep -f, <"$dir/*">
      or die "Problem getting filenames in $dir/: $!";

    local $/;

    for my $file (@files) {
        open my $fh, '<', $file or die $!;
        my $data = <$fh>;
        close $fh;

        $hash{$1} = $2
          if $data =~ /zone\s+"([^"]+)".+masters\s+{\s*([^}\s]+)\s*}/s
+;
    }

    return %hash;
}
[download]

Now there's a check for file names being read from the desired directory. The script will die with a message if none were read.

If you're still getting the same results, temporarily place the following just below the close $fh; line:

print $data;
exit;
[download]

You should see a zone stanza that the regex would process. If not, the next step would be to figure out why the file contents are not being read into $data.