comment on

I have taken another approach to what I think you are trying to do. Hopefully you can use this to achieve what you want.

use strict;
use warnings;

my @tmp;
my @keep;
my $first_time = 1;

while (my $a_line = <DATA>) {
    chomp $a_line;
    push @tmp, $a_line;
    if ( $a_line =~ /^\d+\s+\D+/ ) 
    {
        if ($first_time) 
        {
            $first_time = 0;
        }
        else 
        {
                #we have a new host master record
                #process the data from the previous host
            process_previous(\@tmp);
            @keep = (@keep, @tmp);
            @tmp =();
        }
    }
}

process_previous(\@tmp);
@keep = (@keep, @tmp);
@tmp=();

print "$_\n" for @keep;
exit(0);

#----------------- SUBS ----------------------------
sub process_previous {
    my $array_ref = shift;
    my $keep_this_data = 0;
    foreach my $elem(@$array_ref) 
    {
        if ($elem !~ /\d:\d:\d$/ ) 
        {
            $keep_this_data = 1;
            last;
        }
    }

    if (!$keep_this_data) 
    {
        #empty the array
        @$array_ref = ();
    }
}

__DATA__
7 hostname12 Generic-legacy 10000000AB210ACF6 ---
                             10000000AB210ACF4 2:5:4
                             10000000AB210ACF4 2:3:4
                             10000000AB210ACF6 3:5:4
9 hostname13 Generic        10000000AB2A3006A 3:5:2
                             10000000AB2A30068 2:5:2
23 srvernam   Generic-legacy 5001438002A3004A 3:3:3
                             5001438002A3004A ---
                             5001438002A30048 2:3:3
                             5001438002A30048 2:5:2
                             5001438002A30048 2:5:2
9 hostname13 Generic        10000000AB2A3006A 3:5:2
                             10000000AB2A30068 2:5:2
21 HOSTNAME   Generic
9 hostname13 Generic        10000000AB2A3006A 3:5:2
                             10000000AB2A30068 2:5:2
[download]

output

7 hostname12 Generic-legacy 10000000AB210ACF6 ---
                             10000000AB210ACF4 2:5:4
                             10000000AB210ACF4 2:3:4
                             10000000AB210ACF6 3:5:4
23 srvernam   Generic-legacy 5001438002A3004A 3:3:3
                             5001438002A3004A ---
                             5001438002A30048 2:3:3
                             5001438002A30048 2:5:2
                             5001438002A30048 2:5:2
21 HOSTNAME   Generic
[download]

I hope this helps.

Arnaud

In reply to Re: Regex to extract certain lines only from command output/text file. by arnaud99
in thread Regex to extract certain lines only from command output/text file. by perl514

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