Particular line match using regex

Question

This script may take a while to run, especially on a busy podmaster.
Generating Syslog TopN list on node for last 3 hours.

        Top 5 hosts for Day: Oct8 between 02:         


        

Answer 1

There's nothing wrong with your regex.

That's just a formatting difference:

use strict;
use warnings;

my $data = do {local $/; <DATA>};

my @ones = $data =~ m/^\s*[1]\s+([\d]+)/mg;

for my $i (0..$#ones) {
    printf "\$%d = %s\n", $i+1, $ones[$i];
}

__DATA__
        Rank       Number of Alerts Host
        ----       ---------------- ----
        1       3124        abc
        2       2294        bcd



        Rank       Number of Alerts Host
        ----       ---------------- ----
        1       5495        cdf
        2       2625        klm


        Rank       Number of Alerts Host
        ----       ---------------- ----
        1       2747        lll
        2       876         jjj

Outputs:

$1 = 3124
$2 = 5495
$3 = 2747

live demo

Answer 2

Change your regex to the below if the input contains the exact string you posted.

(?s)\s+1+\s+([\d]+).*?\s+1+\s+([\d]+).*?\s+1+\s+([\d]+)

DEMO

For javascript,

\s+1+\s+([\d]+)[\S\s]*?\s+1+\s+([\d]+)[\S\s]*?\s+1+\s+([\d]+)

DEMO

Answer 3

Rank.*?\n.*?\n1\s*(\d+)

Try this.Set flag g.

See demo.

http://regex101.com/r/hQ1rP0/58

Answer 4

Noticed this in your duplicate question about IPautomata designer

We are using new IPsoft tool which has two options.

1. Line Filter(JavaScript regex)
2. Match(JavaScript regex)

For example if we need to match the alertcount(3124). First filter the line >than match the same. Like that I need to match another two alert count(5495 >and 2747). Please help me to sort it out.

If you are trying to capture the output from a host command state, or any state's OUTPUT variable, you can use the Extract Variable tab: Name: capture_variable Line Filter: \s+1\s+.* Match: .*1\s+(\d+).* Replace: $1

this will set the capture_variable equal to a multi-line string like this:

3124
5495
2747