Splunk Search

REX Non-Capture Group


Hi Everyone,

Trying to understand non-capture groups better

Trying to build rex that captures 2 conditions but uses a non-capture for condition one.

Condition one (non capture): Non Capture Message= but capture everything after (Message=)

Condition two: Everything after (:\d:)

Here's what I ended up with but "Message" still shows up in the results:

    | rex "(?i)(?P<TEST>((:\d:)|(?:(Message\=)))[^\$]*)" 
Tags (2)
0 Karma

Esteemed Legend

The main reason to have a non-capture group is because you need to do something to that thing as a group of text but not put it into a field. For example, in a CSV, to grab the 30th thing, you might use this:

| rex "^(?:[^,]*,){29}(?<csv30>[^,]*)"

So because I needed to skip 29 of the same thing, I put that thing (a CSV field plus the delimiting comma) into a (non-capturing) group and applied the multiplier {29}. Then I capture the next thing and name it.

So is your question truly academic or are you trying to do something with some data? If you are trying to do something, then show us the sample event data and describe what fields that you would like to create and we can help some more.

0 Karma
Get Updates on the Splunk Community!

Improve Your Security Posture

Watch NowImprove Your Security PostureCustomers are at the center of everything we do at Splunk and security ...

Maximize the Value from Microsoft Defender with Splunk

 Watch NowJoin Splunk and Sens Consulting for this Security Edition Tech TalkWho should attend:  Security ...

This Week's Community Digest - Splunk Community Happenings [6.27.22]

Get the latest news and updates from the Splunk Community here! News From Splunk Answers ✍️ Splunk Answers is ...