while (<DATA>) {
/object-group\s/;
# print the next word followed by object-group
my @after=split(/\s/,$');
my @array = $after[0];

# unique array NOT working......
my @unique = do { my %seen; grep { !$seen{$_}++ } @array };

    foreach my $var ( @unique ) {
         # remove word - network
         if ($var !~ m/network/) {
         # remove word - service
         next if ($var =~ m/service/);
              print $var, "\n";
         }
    }
}

__DATA__
access-list INSIDE_IN remark Web Users To Web Server
access-list INSIDE_IN extended permit tcp object-group WEB-CLIENT object-group WEB-SERVER object-group WEB_TCP
access-list INSIDE_IN remark EMAIL To EMAIL Server
access-list INSIDE_IN extended permit tcp object-group EMAIL-CLIENT object-group EMAIL-SERVER object-group SMTP_TCP
object-group network PC1_1st
 network-object host 10.1.1.11
object-group network PC2_1st
 network-object host 10.1.1.12
object-group network WEB-CLIENT
 group-object PC1_1st
 group-object PC2_1st
object-group network WEB-SERVER
 network-object host 10.1.1.5
object-group service WEB_TCP tcp
 port-object eq www
 port-object eq https
object-group network EMAIL-CLIENT
 group-object PC1_1st
 group-object PC2_1st
object-group network EMAIL-SERVER
 network-object host 10.1.1.6
object-group service SMTP_TCP tcp
 port-object eq SMTP

##</code><code>##

access-list INSIDE_IN extended permit tcp object-group WEB-CLIENT object-group WEB-SERVER object-group WEB_TCP<br>

##</code><code>##

access-list INSIDE_IN extended permit tcp object-group WEB-CLIENT object-group WEB-SERVER object-group WEB_TCP
object-group network WEB-CLIENT
 group-object PC1_1st
 group-object PC2_1st
object-group network PC1_1st
 network-object host 10.1.1.11
object-group network PC2_1st
 network-object host 10.1.1.12
object-group network WEB-SERVER
 network-object host 10.1.1.5
object-group service WEB_TCP tcp
 port-object eq www
 port-object eq https

##</code><code>##

access-list INSIDE_IN extended permit tcp object-group EMAIL-CLIENT object-group EMAIL-SERVER object-group SMTP_TCP
object-group network EMAIL-CLIENT
 group-object PC1_1st
 group-object PC2_1st
object-group network PC1_1st
 network-object host 10.1.1.11
object-group network PC2_1st
 network-object host 10.1.1.12
object-group network EMAIL-SERVER
 network-object host 10.1.1.6
object-group service SMTP_TCP tcp
 port-object eq SMTP