Splunk Search

Field extraction

Sheela
Path Finder

I want to create report for events whose field names haven't been extracted. I have SSH logs of the format "Accepted publickey for user XYZ" , "Accepted publickey for user ABC" and so on. I want to collect statistics for XYZ and other users. When I test an extraction, I get a javascript error on page which says invalid argument. Even if I save a field extraction, I'm not able to use it in my search. Can someone please tell me how to go about it?

Tags (1)
0 Karma
1 Solution

MarioM
Motivator

I am not sure why you getting java script error maybe an issue with your browser...

There are several methods to extract fields:

First i usually use erex to see what regex will catch my field values:

... | erex user examples="XYZ, ABC" counterexamples="99/2"

Then it will give me a regex which i would use in rex command:

... | rex field=_raw "Accepted\spublickey\sfor\suser\s(?<user>.*[^\s]) "

Then I Use the Field extractions page in Manager.

Here you will find all the methods to extract fields : Fields and field extractions

View solution in original post

MarioM
Motivator

I am not sure why you getting java script error maybe an issue with your browser...

There are several methods to extract fields:

First i usually use erex to see what regex will catch my field values:

... | erex user examples="XYZ, ABC" counterexamples="99/2"

Then it will give me a regex which i would use in rex command:

... | rex field=_raw "Accepted\spublickey\sfor\suser\s(?<user>.*[^\s]) "

Then I Use the Field extractions page in Manager.

Here you will find all the methods to extract fields : Fields and field extractions

Sheela
Path Finder

That worked perfectly! Thanks.

0 Karma
Got questions? Get answers!

Join the Splunk Community Slack to learn, troubleshoot, and make connections with fellow Splunk practitioners in real time!

Meet up IRL or virtually!

Join Splunk User Groups to connect and learn in-person by region or remotely by topic or industry.

Get Updates on the Splunk Community!

Why Splunk Customers Should Attend Cisco Live 2026 Las Vegas

Why Splunk Customers Should Attend Cisco Live 2026 Las Vegas     Cisco Live 2026 is almost here, and this ...

What Is the Name of the USB Key Inserted by Bob Smith? (BOTS Hint, Not the Answer)

Hello Splunkers,   So you searched, “what is the name of the usb key inserted by bob smith?”  Not gonna lie… ...

Automating Threat Operations and Threat Hunting with Recorded Future

    Automating Threat Operations and Threat Hunting with Recorded Future June 29, 2026 | Register   Is your ...