One of the main problems is your regex. You need it to be intepreted as a pattern, since you have multiple items separated by |, yet you can't have the () interpreted because those are regex special characters. So you have to backslash the ().

use strict;
use warnings;

my $pattern = 'Win2k8_Trace_db|Win2k3_test \(e4ba25c7-5628-45d8-97a7-8
+3331e7ad7e1\)|iserver7 \(035e60d4-3073-4fcc-a78e-6a718b3b502f\)|iserv
+er6 \(b93b57e2-ab74-441a-98a7-35dc71feca12\)';

@::FileLines = <DATA>;

for (@::FileLines) {
    chomp;
    next if !$_ || m/$pattern/;
    @_ = split /\^/;
    print "$_[1]\n";
}

__DATA__
Memory^Memory^Free MBytes,80124,85490,81912.39,100,Alert,Migrate high 
+memory consuming VM to another host.^M

DvsPortset-0:130066:Win2k3_test (e4ba25c7-5628-45d8-97a7-83331e7ad7e1)
+^Network Port^% Outbound Packets Dropped,0.00,0.00,0,0,OK,

DvsPortset-0:130066:Win2k3_test (e4ba25c7-5628-45d8-97a7-83331e7ad7e1)
+^Network Port^% Received Packets Dropped,0.00,0.00,0,0,OK,

_Total)^Physical Cpu^% Processor Time,0.63,13.49,6.27,0,OK,

Win2k3_test (e4ba25c7-5628-45d8-97a7-83331e7ad7e1)^Virtual Disk^Comman
+ds/sec,0.00,6.72,2,0,OK,

iserver6 (b93b57e2-ab74-441a-98a7-35dc71feca12)^Virtual Disk^Writes/se
+c,0.00,21.26,1.63,0,OK,

iserver7 (035e60d4-3073-4fcc-a78e-6a718b3b502f)^Virtual Disk^Commands/
+sec,0.00,104.15,18.96,0.49,OK,

Win2k8_Trace_db^Group Cpu^% Used,0.55,8.88,4.07,0,OK,
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