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What rex command can separate hostname from the field?

priya1926
Path Finder

NONPROD:abcd123456_DBSERVER

Need to extract abcd123456 from the string...

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ITWhisperer
SplunkTrust
SplunkTrust

Without the full context of the string or knowing which parts are fixed, I have guessed you want anything between the colon and the underscore:

| rex ":(?<hostname>[^_]+)_"

 

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