Splunk Search

Regex Help

mikefoti
Communicator

A complete event record looks like this:

Row 114005: Requester Name: "RETAIL\S2343W01$" Issued Common Name: "S2343W01.retail.fakename.com" User Principal Name: "S2343W01.retail.fakename.com" Serial Number: "4c22be0100010002d317" Certificate Template: Client Authentication - Retail Desktops Certificate Effective Date: 12/1/2011 10:38 AM Certificate Expiration Date: 11/30/2012 10:38 AMMaximum Row Index: 114005

My Regex to capture a cert_SN field looks like this:

(?i)Serial Number: “(?P<cert_SN>.+?\n)

The result captures the seriel number PLUS the final quote i.e.

cert_SN = 4c22be0100010002d317"

How can I eliminate the final quote?

Tags (1)
0 Karma
1 Solution

_d_
Splunk Employee
Splunk Employee

You can try either of these:

(?i)Serial Number:\s\"(?P<cert_sn>\w+)\"

OR

(?i)Serial Number:\s\"(?P<cert_sn>\w+)

-->
EDIT: In case you need to capture empty fields then try this:

(?i)Serial Number:\s\"(?P<cert_sn>[^\"]*)\"

This will capture everything between "" even when there are no spaces between quotes. If you know for certain that there will be spaces between quotes then change * to +.

Hope this helps.

> please upvote and accept answer if you find it useful - thanks!

View solution in original post

_d_
Splunk Employee
Splunk Employee

You can try either of these:

(?i)Serial Number:\s\"(?P<cert_sn>\w+)\"

OR

(?i)Serial Number:\s\"(?P<cert_sn>\w+)

-->
EDIT: In case you need to capture empty fields then try this:

(?i)Serial Number:\s\"(?P<cert_sn>[^\"]*)\"

This will capture everything between "" even when there are no spaces between quotes. If you know for certain that there will be spaces between quotes then change * to +.

Hope this helps.

> please upvote and accept answer if you find it useful - thanks!

mikefoti
Communicator

both work equally well both both also fail to pick up a value of EMPTY... which is weird... seems like /w ought to match EMPTY or anyother word?!?!?

0 Karma
Get Updates on the Splunk Community!

Index This | What is broken 80% of the time by February?

December 2025 Edition   Hayyy Splunk Education Enthusiasts and the Eternally Curious!    We’re back with this ...

Unlock Faster Time-to-Value on Edge and Ingest Processor with New SPL2 Pipeline ...

Hello Splunk Community,   We're thrilled to share an exciting update that will help you manage your data more ...

Splunk MCP & Agentic AI: Machine Data Without Limits

Discover how the Splunk Model Context Protocol (MCP) Server can revolutionize the way your organization uses ...