Based on how I interpret your request, I think this is what you want. 
#!/usr/bin/perl

use strict;

my $pattern = qr/Latest \d+ Items in /
            . qr/Feed & \d New Fetched items/;

while (<DATA>) {
    print if /$pattern/;
}

__DATA__
Latest 29 Items in Feed & 0 New Fetched items
Testing
Latest 28 Items in Feed & 0 New Fetched items

Latest 100 Items
Latest 28 Items in Feed & 0 New Fetched items

[download]

In reply to Re: Generalising string in pattern by bichonfrise74
in thread Generalising string in pattern by rajyalakshmi

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