G'day saro,

Welcome to the Monastery.

I suspect there's more to this than you're telling us; however, based on what you have provided, I'd probably aim for a technique such as this: 

#!/usr/bin/env perl

use strict;
use warnings;

my $flag = 'NINE';

while (<DATA>) {
    print if (split)[0] eq $flag;
}

__DATA__
DATA.TXT
==============
ONE TWO THREE FOUR FIVE SIX SEVEN EIGHT
NINE TEN ELEVEN TWELEVE 12-MAR-2020 /net/slcnas22/scratch/domain_name 
+http://testurl/home username_pwd
THIRTEEN FOURTEEN FIFTEEN
SIXTEEN SEVENTEEN EIGHTEEN NINETEEN TWENTY

[download]

Output:

NINE TEN ELEVEN TWELEVE 12-MAR-2020 /net/slcnas22/scratch/domain_name 
+http://testurl/home username_pwd

[download]

I see that ++Discipulus has provided a number of good documentation links; although, this technique does not require chomp nor does it use regexes. I also suggest you look at the autodie pragma: I highly recommend it.

— Ken

In reply to Re: find the string in the file and print its subsequent strings by kcott
in thread find the string in the file and print its subsequent strings by saro

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