Splunk Search

Regex matching in search when it doesn't in regex creator

beaunewcomb
Communicator

This regex is actually a lot longer, and obviously the events are too, but here's what appears to be happening. I want data out of paranthesis in the format below, EXCEPT for when the word in front of the paren is "trans" like below. So I'm using ^ to specify what I don't want to match. It appears to work fine in the regex builder, but when I search for object=* I'm getting the objects after trans as well.

I wrote in additional regex to try to filter anything with just numbers, but that shows the same behavior. Is it something with ^ ?

mq-qm(QMNGRBKUP_01)

trans(30251343)

[^trans][\w'-]+((?P[^0-9][\w'-]+)

Tags (1)
0 Karma
1 Solution

Ayn
Legend

Brackets in regexes denote a range of characters, and the ^ character within brackets negate the match. So [^trans] does NOT perform a negated match on the string "trans", rather it matches one of the characters t, r, a, n and s. To do that kind of match you need a negative lookbehind (http://www.regular-expressions.info/lookaround.html ).

(?<!trans)[\w'-]+\((?P<object>[^0-9][\w'-]+)

I still think it shouldn't be matching anyway though, because [^trans] will match on the last s in the word...

View solution in original post

Ayn
Legend

Brackets in regexes denote a range of characters, and the ^ character within brackets negate the match. So [^trans] does NOT perform a negated match on the string "trans", rather it matches one of the characters t, r, a, n and s. To do that kind of match you need a negative lookbehind (http://www.regular-expressions.info/lookaround.html ).

(?<!trans)[\w'-]+\((?P<object>[^0-9][\w'-]+)

I still think it shouldn't be matching anyway though, because [^trans] will match on the last s in the word...

beaunewcomb
Communicator

Thank you for the insight. you're right on both accounts... where I messed up was I had a different extraction for trans which was setting as well.

So now I also know how to use multiple regexes for one field 😛

Thanks again for your expertise

0 Karma
Get Updates on the Splunk Community!

Introducing the 2024 SplunkTrust!

Hello, Splunk Community! We are beyond thrilled to announce our newest group of SplunkTrust members!  The ...

Introducing the 2024 Splunk MVPs!

We are excited to announce the 2024 cohort of the Splunk MVP program. Splunk MVPs are passionate members of ...

Splunk Custom Visualizations App End of Life

The Splunk Custom Visualizations apps End of Life for SimpleXML will reach end of support on Dec 21, 2024, ...