Splunk Search

Field Extraction of particular data from user defined field

jlattus
New Member

I'm trying to pull a certain type of data from a field but that field can change into different types of data depending on the log. I only want to keep the particular data and ignore the rest.

An example would be a field called "username". I don't care when username=root but when username="any other user" I want to grab that data only. Is there a way to do this? I appreciate any feedback.

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1 Solution

bbingham
Builder

during search time you can use the command "rex" to extract a piece of another field. rex uses regex on top of any data to create new fields (or replace).

|rex field=username "(?<username2>\w+)"

This builds a new field username2 with any username. So same type of concept, since you can use regex, do conditional lookahead matching:

|rex field=username "(?<username2>(?!root)\w+)"

This should match the field only if root is not matched.

Hope that helps.

View solution in original post

bbingham
Builder

during search time you can use the command "rex" to extract a piece of another field. rex uses regex on top of any data to create new fields (or replace).

|rex field=username "(?<username2>\w+)"

This builds a new field username2 with any username. So same type of concept, since you can use regex, do conditional lookahead matching:

|rex field=username "(?<username2>(?!root)\w+)"

This should match the field only if root is not matched.

Hope that helps.

jlattus
New Member

Awesome thanks!

0 Karma
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