I'm not entirely sure I understand your requirement, but if I do, this might fill the bill: 

>perl -wMstrict -MData::Dump -le
"my @subnets = (
   { qw(id 1  location_id 30  subnet 255.255.255.0) },
   { qw(id 2  location_id 13  subnet 255.255.254.0) },
   { qw(id 3  location_id 19  subnet 255.255.0.0  ) },
   );
 dd \@subnets;
 ;;
 my @filers_info = (
   { qw(id 1  location_id 19  info blah1) },
   { qw(id 2  location_id 30  info blah1) },
   { qw(id 3  location_id 99  info yada1) },
   );
 dd \@filers_info;
 ;;
 my %locations = map { $_->{location_id}, 1 } @subnets;
 dd \%locations;
 ;;
 my @filer_ids = grep $locations{ $_->{location_id} }, @filers_info;
 dd \@filer_ids;
"
[
  { id => 1, location_id => 30, subnet => "255.255.255.0" },
  { id => 2, location_id => 13, subnet => "255.255.254.0" },
  { id => 3, location_id => 19, subnet => "255.255.0.0" },
]

[
  { id => 1, info => "blah1", location_id => 19 },
  { id => 2, info => "blah1", location_id => 30 },
  { id => 3, info => "yada1", location_id => 99 },
]

{ 13 => 1, 19 => 1, 30 => 1 }

[
  { id => 1, info => "blah1", location_id => 19 },
  { id => 2, info => "blah1", location_id => 30 },
]

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In reply to Re: Matching values between two arrays of hashes. by AnomalousMonk
in thread Matching values between two arrays of hashes. by tacoking92

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