my $line = 'fee fi fo fum';
my $pat = qr/i smell the blood/;
unless( grep /$pat/, $line ){
    print "of an englishman\n";
}
__END__
[download]

Prints "of an englishman", because $line doesn't match $pat

That condition is more commonly written as one of these

unless( $line =~ /$pat/ ) { ...
if( not $line =~ /$pat/ ) { ...
if( $line !~ /$pat/ ) { ...
[download]

Thanks for the reply. I used your recommendation to use qr but unfortunately it still has issues concerning to quotemeta related lines. My txt file is a combination of normal as well as quotemeta related lines. So at a time I am able to get output either for normal lines or quotemeta lines. Please correct me if I doing something wrong.

unless($line =~ qr/$pattern/){ ... #works only for normal lines
unless($line =~ qr/\Q$pattern\E/){... #both normal as well as quotemet
+a related lines are failing and everything is getting list in output.
[download]

Could you please let me know what is wrong step I am doing?

Could you please let me know what is wrong step I am doing?

You're using the qr operator as if it were the m operator (match), but they're not the same. See Regexp Quote-Like Operators in perlop

And you only quotemeta arbitrary text you wish to match verbatim, not regex patterns.

You can build an efficient regex pattern out of a list of arbitrary text with Regex::PreSuf.

These are just stylistic issues and won't help you solve your problem, but...

foreach my $line (@::FileLines) {
   unless(grep(/$pattern/,$line)){
         my @karatSplit = split('\^', $line);
         print "$karatSplit[1]\n";
   }
}
[download]

That code can be better written as:

foreach my $line (@::FileLines) {
  next unless grep(...);

  my @karatSplit = ...
}
[download]

Also, @::FileLines looks like bad design (why are you directly accessing an array in your main module, instead of using a reference to it?)

please bare with

I'd rather bear with.

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,
[download]

Thanks TJPride.. Infact () inside the pattern was the issue. Your suggestion worked absolutely fine. Thanks again..