That's all quite lovely - I'd like a puppy. While there are plenty of people here who are happy to help, the tone I get from your message is that you want us to do your work for you. I assume that this is unintentional, but please be cognizant of how you ask questions in the future. See How do I post a question effectively?.

Also note the material you posted is far more complicated than it need be - you are using 7 different modules and have strict commented out when you really just need know how to process your sample input. You also can include multiple instances of <code> tags in one post, and this can really aid in clarity.

I don't understand what you mean by case 3 (an example is worth 1,000 words) but everything else you ask can be done in a fairly straight-forward fashion using regular expressions and Loop Control. I've crafted up some simple treatments, where I've assumed $res->result() returns a scalar string as indicated by your Data::Dumper output. If anything is unclear, I'll be happy to clarify: 

#!/usr/bin/perl
use strict;
use warnings;
use Data::Dumper;

my $data = do{local $/; <DATA>};

print Dumper([$data]), "\n\n";

my $result_1;
for (split /(?<=\n)/, $data) {
    next unless /^\Qsnmp-server host\E/;
    $result_1 .= $_;
}
print "---Result 1---\n$result_1\n\n";

my $result_2;
for (split /(?<=\n)/, $data) {
    next unless /^\Qsnmp-server\E/;
    s/^((?:\S+\s+){3})\S+/${1}Bob/;
    $result_2 .= $_;
}
print "---Result 2---\n$result_2\n\n";

__DATA__
snmp-server host 10.234.171.45 admin
snmp-server host 10.234.171.46 admin
snmp-server host 10.234.171.51 admin  frame-relay config snmp
snmp-server host 10.234.171.75 admin
snmp-server host 10.234.171.51 publ  frame-relay config snmp
snmp-server host 10.234.171.54 publ  frame-relay config snmp
snmp-server host 10.234.171.59 publ
!snmp-server host 10.234.171.46 admin
snmp-server host 10.234.171.51 admin  frame-relay config snmp
snmp-server host 10.234.171.75 admin
snmp-server host 10.234.171.51 publ  frame-relay config snmp
snmp-server host 10.234.171.54 publ  frame-relay config snmp
snmp-server host 10.234.171.59 publ
!snmp-server host 10.234.171.51 admin  frame-relay config snmp
snmp-server host 10.234.171.75 admin
snmp-server host 10.234.171.51 publ  frame-relay config snmp
snmp-server host 10.234.171.54 publ  frame-relay config snmp
snmp-server host 10.234.171.59 publ
!snmp-server host 10.234.171.75 admin
snmp-server host 10.234.171.51 publ  frame-relay config snmp
snmp-server host 10.234.171.54 publ  frame-relay config snmp
snmp-server host 10.234.171.59 publ
!snmp-server host 10.234.171.51 publ  frame-relay config snmp
snmp-server host 10.234.171.54 publ  frame-relay config snmp
snmp-server host 10.234.171.59 publ
!snmp-server host 10.234.171.54 publ  frame-relay config snmp
snmp-server host 10.234.171.59 publ
!snmp-server host 10.234.171.59 publ
!

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In reply to Re: pulling more data from an array by kennethk
in thread pulling more data from an array by zonevbkr

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