Perhaps the following will offer some direction:

use strict;
use warnings;

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

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

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

    local $/;

    for my $file ( grep -f, <"$dir/*"> ) {
        open my $fh, '<', $file or die $!;
        my $data = <$fh>;
        close $fh;

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

There are three files in the directory zones, and each contains only one of the following zone stanzas:

zone "zone.com" {
    type slave;
    file "path/to/db.zone";
    masters {ip.add.ress.here};
};
zone "cnn.com" {
    type slave;
    file "path/to/db.zone";
    masters { cnn.add.ress.here };
};
zone "perlmonks.org" {
    type slave;
    file "path/to/db.zone";
    masters { 
        ip.perlmonks.ress.here 
            };
};
[download]

Output:

cnn.com -> cnn.add.ress.here
perlmonks.org -> ip.perlmonks.ress.here
zone.com -> ip.add.ress.here
[download]

The subroutine getZoneHash takes a directory parameter, and then opens, reads, and captures the zone info and masters ip address of the zone stanza in each file in that directory, building and returning a hash.

The capturing regex:

/zone\s+"([^"]+)".+masters\s+{\s*([^}\s]+)\s*}/s
      ^ ^   ^   ^          ^   ^     ^     ^   ^
      | |   |   |          |   |     |     |   |
      | |   |   |          |   |     |     |   + - Treat string as sin
+gle line
      | |   |   |          |   |     |     + - 0+ whitespaces
      | |   |   |          |   |     + - Match anything that's not } o
+r a whitespace
      | |   |   |          |   + - 0+ whitespaces
      | |   |   |          + - 1+ whitespaces
      | |   |   + - End quotation
      | |   + - Match anything that's not a "
      | + - Begin quotation
      + - 1+ whitespaces
[download]

Hope this helps!

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