Gsub syntax to remove all before \

Elastic Stack Logstash
1

Hi,

I'm trying to write up a gsub to remove everything before a slash. My input will come in the format of something similar to:

LP-45XP\joe.bloggs
3G49-2AP\john.doe
random_PC-domain_name\random_firstname.random_lastname

All I'm looking for is the firstname.lastname from the field.

Currently, after trying all sorts of iterations, I have:

gsub => [ "UserName", "[*\\]", "" ]

Still doesn't fix my problem.

Could I get a pointer on the structure of the gsub I need and the method behind it?

Thanks.

2

can you give the entire filter ?
also your regex isn't correct, try this "(.*\\)" instead of "[*\\]"

3

Thanks for the reply. I'd already tried that particular syntax but still no luck. The full filter is shown below. I'm essentially pulling in a txt file as a key/value pair, mutating some of it and pushing it to Elastic. The UserName field contains either the PC name and the username separated by a \ or the domain name and username in the same format.

filter {
  if [type] == "log" {
		kv {
    field_split => ";"
		value_split => "="
		trim_value => "\s"
		}
		
date {
        match => [ "EventTime", "YYYY-MM-dd HH:mm:ss" ]
        target => "@timestamp"
	    timezone => "Europe/London"
     }
	 
mutate {
		gsub => [ "UserName", "(.*\\)", "" ]
		gsub => [ "ComputerIPAddress", "\r", "" ]
		remove_field => [ "message" ]
	}
	}
}

Thanks.