# What is the grok expression that can match variable length documents from a single log file?
**URL:** https://discuss.elastic.co/t/what-is-the-grok-expression-that-can-match-variable-length-documents-from-a-single-log-file/285320
**Category:** Logstash
**Created:** [September 28, 2021, 7:48am UTC](https://discuss.elastic.co/t/what-is-the-grok-expression-that-can-match-variable-length-documents-from-a-single-log-file/285320 "2021-09-28T07:48:52Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@shi](https://discuss.elastic.co/u/shi)
#### Post date: [September 28, 2021, 7:48am UTC](https://discuss.elastic.co/t/what-is-the-grok-expression-that-can-match-variable-length-documents-from-a-single-log-file/285320/1 "2021-09-28T07:48:52Z")
A log file is having records of different leighths, say 3 different types of records?
what is the grok expression that can match variable length documents from a single log file?
This will be very useful for creating index and ingest node for it via the interface provided by kibana (upload sample file)
regards
shini
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### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [October 25, 2021, 7:32pm UTC](https://discuss.elastic.co/t/what-is-the-grok-expression-that-can-match-variable-length-documents-from-a-single-log-file/285320/2 "2021-10-25T19:32:41Z")
This is really hard to answer without any example data. grok matches fields regular expressions. A regexp can match literally anything.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 22, 2021, 7:33pm UTC](https://discuss.elastic.co/t/what-is-the-grok-expression-that-can-match-variable-length-documents-from-a-single-log-file/285320/3 "2021-11-22T19:33:00Z")
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