# Grok parser on amount of characters

**URL:** https://discuss.elastic.co/t/grok-parser-on-amount-of-characters/276924
**Category:** Logstash
**Created:** [June 24, 2021, 12:34pm UTC](https://discuss.elastic.co/t/grok-parser-on-amount-of-characters/276924 "2021-06-24T12:34:54Z")
**Posts on this page:** 3
**Page:** 1

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### Author: ![Soren\_vdc](https://avatars.discourse-cdn.com/v4/letter/s/b4bc9f/32.png) [@Soren\_vdc](https://discuss.elastic.co/u/Soren_vdc)
#### Post date: [June 24, 2021, 12:34pm UTC](https://discuss.elastic.co/t/grok-parser-on-amount-of-characters/276924/1 "2021-06-24T12:34:54Z")

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Hi,

I want to grok match on a sting where the first part contains 3 letters. For example:  
BUR-TEST-TEST-TEST

I want to check that the first part contains 3 charachters (in this case BUR).  
is that possible with grok match?

thx!  
br  
Sören

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### Author: ![Cad](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/cad/32/86661_2.png) [@Cad](https://discuss.elastic.co/u/Cad)
#### Post date: [June 24, 2021, 2:40pm UTC](https://discuss.elastic.co/t/grok-parser-on-amount-of-characters/276924/2 "2021-06-24T14:40:33Z")

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Hi,

A pattern like `(?<field>[a-zA-Z]{3})` take the three first character if they are letters.

Cad.

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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 22, 2021, 2:41pm UTC](https://discuss.elastic.co/t/grok-parser-on-amount-of-characters/276924/3 "2021-07-22T14:41:10Z")

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