Splunk Search

How to create rex to extract field?

Harish2
Path Finder

From here i need to extarct the identification=MLAS, MLA, LAS and VAM
My sample logs:
[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid="7689-jhgg-8765r-kkjggt"; app=" "; QueryLetter="yard=MS&identification=MLAS&timeRange=EVERYDAY&timePeriod=MINUTES

[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid="7689-jhgg-8765r-kkjggt"; app=" "; QueryLetter="yard=MS&identification=MLA&timeRange=EVERYDAY&timePeriod=MINUTES

[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid="7689-jhgg-8765r-kkjggt"; app=" "; QueryLetter="yard=MS&identification=LAS&timeRange=EVERYDAY&timePeriod=MINUTES

[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid="7689-jhgg-8765r-kkjggt"; app=" "; QueryLetter="yard=MS&identification=VAM&timeRange=EVERYDAY&timePeriod=MINUTES

in my selected fileds or intresting fileds  indeentification fileds  should appear has below:
MLAS
MLA
LAS 
VAM

Labels (1)
0 Karma
1 Solution

richgalloway
SplunkTrust
SplunkTrust

The rex command works for me.

| rex "identification=(?<identification>\w+)"
---
If this reply helps you, Karma would be appreciated.

View solution in original post

yuanliu
SplunkTrust
SplunkTrust

Are posted logs raw events?  Is there some settings in your sourcetype (props.conf) that prevents automatic extraction of the fields you wanted?  Because the field names and values are connected by equal sign, Splunk should have already extracted them.

Here is an emulation of your samples:

 

| makeresults
| fields - _time
| eval data = split("[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid=\"7689-jhgg-8765r-kkjggt\"; app=\" \"; QueryLetter=\"yard=MS&identification=MLAS&timeRange=EVERYDAY&timePeriod=MINUTES
[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid=\"7689-jhgg-8765r-kkjggt\"; app=\" \"; QueryLetter=\"yard=MS&identification=MLA&timeRange=EVERYDAY&timePeriod=MINUTES
[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid=\"7689-jhgg-8765r-kkjggt\"; app=\" \"; QueryLetter=\"yard=MS&identification=LAS&timeRange=EVERYDAY&timePeriod=MINUTES
[12/12/21] 12:10:112 GMT] I6789HIOO applicattion authenticationid=100| |35467577889999| |67775-ghhgfrt-6788h-7667788; clientid=\"7689-jhgg-8765r-kkjggt\"; app=\" \"; QueryLetter=\"yard=MS&identification=VAM&timeRange=EVERYDAY&timePeriod=MINUTES", "
")
| mvexpand data
| rename data AS _raw
| extract

 

 These are the fields extracted:

QueryLetterappauthenticationidclientididentificationtimePeriodtimeRange
"yard=MS 100| |35467577889999| |67775-ghhgfrt-6788h-76677887689-jhgg-8765r-kkjggtMLASMINUTESEVERYDAY
"yard=MS 100| |35467577889999| |67775-ghhgfrt-6788h-76677887689-jhgg-8765r-kkjggtMLAMINUTESEVERYDAY
"yard=MS 100| |35467577889999| |67775-ghhgfrt-6788h-76677887689-jhgg-8765r-kkjggtLASMINUTESEVERYDAY
"yard=MS 100| |35467577889999| |67775-ghhgfrt-6788h-76677887689-jhgg-8765r-kkjggtVAMMINUTESEVERYDAY
0 Karma

richgalloway
SplunkTrust
SplunkTrust

The rex command works for me.

| rex "identification=(?<identification>\w+)"
---
If this reply helps you, Karma would be appreciated.

Harish2
Path Finder

Hi @richgalloway 
it worked, thank you

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!

[Puzzles] Solve, Learn, Repeat: Character substitutions with Regular Expressions

This challenge was first posted on Slack #puzzles channelFor BORE at .conf23, we had a puzzle question which ...

Splunk Community Badges!

  Hey everyone! Ready to earn some serious bragging rights in the community? Along with our existing badges ...

[Puzzles] Solve, Learn, Repeat: Matching cron expressions

This puzzle (first published here) is based on matching timestamps to cron expressions.All the timestamps ...