Splunk Search

Excluding either the start or end of a transaction when parsing result with rex command

jbrenner
Path Finder

I'm using the rex command to parse a value out of the results of a transaction command. Is there an easy way to restrict the resulting capture from searching either the start or end block of the transaction? This would be much easier than doing it in the regex itself, since both blocks of text returned are very similar.

Thanks! Jonathan

Labels (2)
0 Karma

yuanliu
SplunkTrust
SplunkTrust

There is a potentially rather expensive way to do it.  Suppose your raw events are all single lines, you can do something like

 

| eval beginning_of_transaction = mvindex(split(_raw, "
"), 0) ``` use index -1 for end of transaction ```
| rex field=beginning_of_transaction "<your regex>"

 

If the events are not all single line, but there is a distinct string (including newline) to split them without interfering with your regex, this formula can still work.

Update: Your title says to exclude.  If exclusion is the goal, I assume that you meant to exclude start AND end, not start or end.  This can be achieved with

| eval middle_of_transaction = mvindex(split(_raw, "
"), 1, -2)
| rex field=middle_of_transaction "<your regex>"

 

Tags (2)
0 Karma

richgalloway
SplunkTrust
SplunkTrust

The rex command looks at every result.  If you need to exclude certain results then you'll have to craft a regular expression that does so.  Another option is to filter the start and end blocks out of the results - assuming they're not needed for other parts of the query.

---
If this reply helps you, Karma would be appreciated.
0 Karma
Get Updates on the Splunk Community!

Announcing Scheduled Export GA for Dashboard Studio

We're excited to announce the general availability of Scheduled Export for Dashboard Studio. Starting in ...

Extending Observability Content to Splunk Cloud

Watch Now!   In this Extending Observability Content to Splunk Cloud Tech Talk, you'll see how to leverage ...

More Control Over Your Monitoring Costs with Archived Metrics GA in US-AWS!

What if there was a way you could keep all the metrics data you need while saving on storage costs?This is now ...