[regex] Regex to get the words after matching string

Below is the content:

Subject:
    Security ID:        S-1-5-21-3368353891-1012177287-890106238-22451
    Account Name:       ChamaraKer
    Account Domain:     JIC
    Logon ID:       0x1fffb

Object:
    Object Server:  Security
    Object Type:    File
    Object Name:    D:\ApacheTomcat\apache-tomcat-6.0.36\logs\localhost.2013-07-01.log
    Handle ID:  0x11dc

I need to capture the words after the Object Name: word in that line. Which is D:\ApacheTomcat\apache-tomcat-6.0.36\logs\localhost.2013-07-01.log.

How can I do this?

^.*\bObject Name\b.*$ matches - Object Name

You're almost there. Use the following regex (with multi-line option enabled)

\bObject Name:\s+(.*)$

The complete match would be

Object Name:   D:\ApacheTomcat\apache-tomcat-6.0.36\logs\localhost.2013-07-01.log

while the captured group one would contain

D:\ApacheTomcat\apache-tomcat-6.0.36\logs\localhost.2013-07-01.log

If you want to capture the file path directly use

(?m)(?<=\bObject Name:).*$

This is a Python solution.

import re

line ="""Subject:
    Security ID:        S-1-5-21-3368353891-1012177287-890106238-22451
    Account Name:       ChamaraKer
    Account Domain:     JIC
    Logon ID:       0x1fffb

Object:
    Object Server:  Security
    Object Type:    File
    Object Name:    D:\ApacheTomcat\apache-tomcat-6.0.36\logs\localhost.2013-07-01.log
    Handle ID:  0x11dc"""



regex = (r'Object Name:\s+(.*)')
match1= re.findall(regex,line)
print (match1)

*** Remote Interpreter Reinitialized  ***
>>> 
['D:\\ApacheTomcat\x07pache-tomcat-6.0.36\\logs\\localhost.2013-07-01.log']
>>> 

This might work out for you depending on which language you are using:

(?<=Object Name:).*

It's a positive lookbehind assertion. More information could be found here.

It won't work with JavaScript though. In your comment I read that you're using it for logstash. If you are using GROK parsing for logstash then it would work. You can verify it yourself here:

https://grokdebug.herokuapp.com/

But I need the match result to be ... not in a match group...

For what you are trying to do, this should work. \K resets the starting point of the match.

\bObject Name:\s+\K\S+

You can do the same for getting your Security ID matches.

\bSecurity ID:\s+\K\S+

Here's a quick Perl script to get what you need. It needs some whitespace chomping.

#!/bin/perl

$sample = <<END;
Subject:
  Security ID:        S-1-5-21-3368353891-1012177287-890106238-22451
  Account Name:       ChamaraKer
  Account Domain:     JIC
  Logon ID:       0x1fffb

Object:
  Object Server:  Security
  Object Type:    File
  Object Name:    D:\\ApacheTomcat\\apache-tomcat-6.0.36\\logs\\localhost.2013- 07-01.log
  Handle ID:  0x11dc
END

my @sample_lines = split /\n/, $sample;
my $path;

foreach my $line (@sample_lines) {
  ($path) = $line =~ m/Object Name:([^s]+)/g;
  if($path) {
    print $path . "\n";
  }
}