# How can i extract a value from a field as a new field

**URL:** <https://discuss.elastic.co/t/how-can-i-extract-a-value-from-a-field-as-a-new-field/55712>\
**Category:** Logstash\
**Created:** [July 18, 2016, 1:59am UTC](https://discuss.elastic.co/t/how-can-i-extract-a-value-from-a-field-as-a-new-field/55712 "2016-07-18T01:59:55Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![gfafei](https://avatars.discourse-cdn.com/v4/letter/g/a5b964/32.png) [@gfafei](https://discuss.elastic.co/u/gfafei)\
**Post date:** [July 18, 2016, 1:59am UTC](https://discuss.elastic.co/t/how-can-i-extract-a-value-from-a-field-as-a-new-field/55712/1 "2016-07-18T01:59:55Z")

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As the title.For example, extract a property from a url.

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**Author:** ![gfafei](https://avatars.discourse-cdn.com/v4/letter/g/a5b964/32.png) [@gfafei](https://discuss.elastic.co/u/gfafei)\
**Post date:** [July 18, 2016, 7:23am UTC](https://discuss.elastic.co/t/how-can-i-extract-a-value-from-a-field-as-a-new-field/55712/2 "2016-07-18T07:23:29Z")

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It's grok filter, I find it;

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [July 6, 2017, 4:47am UTC](https://discuss.elastic.co/t/how-can-i-extract-a-value-from-a-field-as-a-new-field/55712/3 "2017-07-06T04:47:38Z")

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