# Parse dynamic field names
**URL:** https://discuss.elastic.co/t/parse-dynamic-field-names/306558
**Category:** Logstash
**Created:** [June 7, 2022, 11:30am UTC](https://discuss.elastic.co/t/parse-dynamic-field-names/306558 "2022-06-07T11:30:56Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Soren\_vdc](https://discuss.elastic.co/u/Soren_vdc)
#### Post date: [June 7, 2022, 11:30am UTC](https://discuss.elastic.co/t/parse-dynamic-field-names/306558/1 "2022-06-07T11:30:56Z")
Hi,
I want to parse some code in message field where the field names contains a number. Example:
responseGENERATED\_100=76 SENT\_100=76
responseGENERATED\_180=221 SENT\_180=221
responseGENERATED\_190=0 SENT\_183=0
The filename is different for other values (100,180,190,...)
With grok match, I can't add matching in the fieldname. For example:
grok { match =\> [ "responsegenerated\_%{NUMBER:number}", "%{NUMBER:responsegenerated\_%{NUMBER:number} SENT\_100=%{NUMBER:responsegenerated\_%{NUMBER:number}\_send}
Is there another possible solution to avoid grok match for all possible numbers.
br
Sören
---
### Author:  [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [June 7, 2022, 4:43pm UTC](https://discuss.elastic.co/t/parse-dynamic-field-names/306558/2 "2022-06-07T16:43:27Z")
If you want to extract the numbers then use
```
responseGENERATED_%{NUMBER:a}=%{NUMBER:b} SENT_%{NUMBER:c}=%{NUMBER:d}
```
If you want the field name to be responseGENERATED\_180 then use a kv filter, not grok.
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [July 5, 2022, 4:43pm UTC](https://discuss.elastic.co/t/parse-dynamic-field-names/306558/3 "2022-07-05T16:43:52Z")
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