# Extracting a key value pair in which the key contains certain string
**URL:** https://discuss.elastic.co/t/extracting-a-key-value-pair-in-which-the-key-contains-certain-string/108384
**Category:** Logstash
**Created:** [November 20, 2017, 12:41pm UTC](https://discuss.elastic.co/t/extracting-a-key-value-pair-in-which-the-key-contains-certain-string/108384 "2017-11-20T12:41:49Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@abhilash3011](https://discuss.elastic.co/u/abhilash3011)
#### Post date: [November 20, 2017, 12:41pm UTC](https://discuss.elastic.co/t/extracting-a-key-value-pair-in-which-the-key-contains-certain-string/108384/1 "2017-11-20T12:41:49Z")
Hi all, I am parsing my data as key value pair using kv filter.
I want to extract only the key which contain a certain string. For example if my string is "name". then i want to extract keys which are "myname", yourname, company\_name etc. Is there any way to do it without writing ruby code?
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### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [November 22, 2017, 9:14am UTC](https://discuss.elastic.co/t/extracting-a-key-value-pair-in-which-the-key-contains-certain-string/108384/2 "2017-11-22T09:14:22Z")
The kv filter doesn't support this out of the box, but you can use a prune filter to remove fields except those matching a regexp.
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 20, 2017, 9:14am UTC](https://discuss.elastic.co/t/extracting-a-key-value-pair-in-which-the-key-contains-certain-string/108384/3 "2017-12-20T09:14:22Z")
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