# Grok filter on dynamic source field name
**URL:** https://discuss.elastic.co/t/grok-filter-on-dynamic-source-field-name/153640
**Category:** Logstash
**Created:** [October 23, 2018, 3:13pm UTC](https://discuss.elastic.co/t/grok-filter-on-dynamic-source-field-name/153640 "2018-10-23T15:13:59Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@rodLN](https://discuss.elastic.co/u/rodLN)
#### Post date: [October 23, 2018, 3:13pm UTC](https://discuss.elastic.co/t/grok-filter-on-dynamic-source-field-name/153640/1 "2018-10-23T15:13:59Z")
I'm applying a grok filter followed by a kv successfully on a log entry that looks like this:
"Mylog[something=1;somethingelse=NA;another=19163;exception@3257ms=3;total=3258ms;]"
Everything works well for the correctly constructed key=value pairs, but the numeric portion of the 'exception@3257ms=3' entry is dynamic and I end up with many fields named exception@3257, exception@1234, etc.
I want to further parse the field name 'exception@1234' into key = exception value= 1234, is this possible?
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 20, 2018, 3:14pm UTC](https://discuss.elastic.co/t/grok-filter-on-dynamic-source-field-name/153640/2 "2018-11-20T15:14:00Z")
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