# Remove part of a field
**URL:** https://discuss.elastic.co/t/remove-part-of-a-field/51043
**Category:** Logstash
**Created:** [May 26, 2016, 10:29am UTC](https://discuss.elastic.co/t/remove-part-of-a-field/51043 "2016-05-26T10:29:35Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Karl\_Trasschaert](https://discuss.elastic.co/u/Karl_Trasschaert)
#### Post date: [May 26, 2016, 10:29am UTC](https://discuss.elastic.co/t/remove-part-of-a-field/51043/1 "2016-05-26T10:29:35Z")
Hi,
I'm working with phone numbers, i would like to save the 2 or 3 first digit of a phone number ( international code) .
Actually i have a field "called\_number", how can i save the 2 or 3 first digit in another field ? some country have 2 digit, some others have 3 digits.
Thx
---
### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [May 26, 2016, 10:38am UTC](https://discuss.elastic.co/t/remove-part-of-a-field/51043/2 "2016-05-26T10:38:33Z")
Use a grok filter to extract the first few digits.
---
### Author:  [@Karl\_Trasschaert](https://discuss.elastic.co/u/Karl_Trasschaert)
#### Post date: [May 26, 2016, 11:29am UTC](https://discuss.elastic.co/t/remove-part-of-a-field/51043/3 "2016-05-26T11:29:41Z")
could you help me to built that grok ?
---
### Author:  [@Karl\_Trasschaert](https://discuss.elastic.co/u/Karl_Trasschaert)
#### Post date: [May 26, 2016, 12:58pm UTC](https://discuss.elastic.co/t/remove-part-of-a-field/51043/4 "2016-05-26T12:58:34Z")
I just discover that some country prefix has 1 digit, 2 digit, 3 digit or 6 digit.
i would like to base on that tutorial: [http://www.sanjeevnandam.com/blog/logstash-convert-zipcodepostal-code-to-geo\_point-latitudelongitude](http://www.sanjeevnandam.com/blog/logstash-convert-zipcodepostal-code-to-geo_point-latitudelongitude)
but i suppose a have do do multiple check ?
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 6, 2017, 4:56am UTC](https://discuss.elastic.co/t/remove-part-of-a-field/51043/5 "2017-07-06T04:56:05Z")