Hello bartrad,

Something like this?

#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';
use Data::Dumper;

while (<>) {
    chomp;
    if (/[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/) {
    my @tmp = split /\s+/;
    # print Dumper \@tmp;
    say $tmp[0];
    }
}

__END__

$ perl test.pl in.txt
1.1.1.1:0

[download]

The input format of 'in.txt' is:


======================================================================
+========
LDP Sessions
======================================================================
+========
Peer LDP Id        Adj Type   State         Msg Sent  Msg Recv  Up Tim
+e
----------------------------------------------------------------------
+--------
----------------------------------------------------------------------
+--------
No Matching Entries Found
======================================================================
+========

======================================================================
+========
LDP IPv4 Sessions
======================================================================
+========
Peer LDP Id         Adj Type  State         Msg Sent  Msg Recv  Up Tim
+e
----------------------------------------------------------------------
+--------
1.1.1.1:0     Targeted  Established   822443    822431    273d 15:02:2
+0
----------------------------------------------------------------------
+--------
No. of IPv4 Sessions: 1
======================================================================
+========

[download]

Update: Sorry I missed understood, see bellow another possible solution:


#!/usr/bin/perl
use strict;
use warnings;
use feature 'say';

my $output1 = "=======================================================
+=======================
LDP Sessions
======================================================================
+========
Peer LDP Id        Adj Type   State         Msg Sent  Msg Recv  Up Tim
+e
----------------------------------------------------------------------
+--------
----------------------------------------------------------------------
+--------
No Matching Entries Found
======================================================================
+========";

my $output2 = "=======================================================
+=======================
LDP IPv4 Sessions
======================================================================
+========
Peer LDP Id         Adj Type  State         Msg Sent  Msg Recv  Up Tim
+e
----------------------------------------------------------------------
+--------
1.1.1.1:0     Targeted  Established   822443    822431    273d 15:02:2
+0
----------------------------------------------------------------------
+--------
No. of IPv4 Sessions: 1
======================================================================
+========";

say 'Found 1: ' . $output1 if $output1 =~ (/[0-9]+\.[0-9]+\.[0-9]+\.[0
+-9]+/);
say 'Found 2: ' . $output2 if $output2 =~ (/[0-9]+\.[0-9]+\.[0-9]+\.[0
+-9]+/);

__END__

$ perl test.pl
Found 2: =============================================================
+=================
LDP IPv4 Sessions
======================================================================
+========
Peer LDP Id         Adj Type  State         Msg Sent  Msg Recv  Up Tim
+e
----------------------------------------------------------------------
+--------
1.1.1.1:0     Targeted  Established   822443    822431    273d 15:02:2
+0
----------------------------------------------------------------------
+--------
No. of IPv4 Sessions: 1
======================================================================
+========

[download]

Let me know if it works as expected, BR.

Seeking for Perl wisdom...on the process of learning...not there...yet!

In reply to Re: Regex match multiple line output by thanos1983
in thread Regex match multiple line output by bartrad

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