@NagendraKumar This is not something I have messed with much. The GrokReader is what would be commonly used to parse unstructured data. Your data looks similar to Cisco syslog structure. While the GrokReader has built in pattern file, you may find yourself needing to define a custom pattern file for your specific data. You might find this other community post helpful here: https://community.cloudera.com/t5/Support-Questions/ExtractGrok-processor-Writing-Regex-to-parse-Cis... Hopefully you can use the pattern file example provided through the github post form that other community thread to help create a custom pattern file that works for your specific data: https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/test/resources/TestExtractGrok/patterns Hope you find this information helps you with your use case journey. Please help our community thrive. If you found any of the suggestions/solutions provided helped you with solving your issue or answering your question, please take a moment to login and click "Accept as Solution" on one or more of them that helped. Thank you, Matt
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