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?

In reply to Re^2: unless condition not working by perlavi
in thread unless condition not working by perlavi

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