# Regex to integer\\float
**URL:** https://discuss.elastic.co/t/regex-to-integer-float/54333
**Category:** Logstash
**Created:** [June 29, 2016, 8:54pm UTC](https://discuss.elastic.co/t/regex-to-integer-float/54333 "2016-06-29T20:54:53Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Boris\_Borshevsky](https://discuss.elastic.co/u/Boris_Borshevsky)
#### Post date: [June 29, 2016, 8:54pm UTC](https://discuss.elastic.co/t/regex-to-integer-float/54333/1 "2016-06-29T20:54:53Z")
Hi,
I'm a little new to logstash.
I'm trying to figure out if there is a way to convert fields that match specific regex to integer:
i thought i could do it with grok but something there is not very clear to me.
use case:
if field name starts with n\_ -\> convert value to integer
if field name starts with f\_ -\> convert value to float
else leave it as string
thanks in advance.
---
### Author:  [@noemie](https://discuss.elastic.co/u/noemie)
#### Post date: [June 30, 2016, 7:40am UTC](https://discuss.elastic.co/t/regex-to-integer-float/54333/2 "2016-06-30T07:40:53Z")
Hello,
are the "n\_" and "f\_" sequences present anywhere else in your field names?
If not, you can just test if your field name contains one or the other sequence and then apply the mutate{ convert =\>... } to your fields. I should be possible, all that is required is the right condition for the if
Hope this will help
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### Author:  [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)
#### Post date: [June 30, 2016, 8:48am UTC](https://discuss.elastic.co/t/regex-to-integer-float/54333/3 "2016-06-30T08:48:38Z")
See this response from earlier this morning:
> [@Gsub specific characters but not all of them in value](https://discuss.elastic.co/t/gsub-specific-characters-but-not-all-of-them-in-value/53909/4):
>
> You'll have to use a ruby filter for that. Something similar to ruby { code =\> " event.to\_hash.each { |k, v| event[k] = v.to\_f if k.start\_with? 'metric-' } " } should work.
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### Author:  [@Boris\_Borshevsky](https://discuss.elastic.co/u/Boris_Borshevsky)
#### Post date: [July 3, 2016, 7:12am UTC](https://discuss.elastic.co/t/regex-to-integer-float/54333/4 "2016-07-03T07:12:23Z")
Worked perfectly. thanks.
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### Author:  [@poorbob](https://discuss.elastic.co/u/poorbob)
#### Post date: [June 23, 2017, 5:25pm UTC](https://discuss.elastic.co/t/regex-to-integer-float/54333/5 "2017-06-23T17:25:00Z")
Hey Boris, which route did you end up going with? I'm challenged with a similar situation
edit: the ruby filter will work well for this. However, as of logstash 5.x directly editing a fields value is not allowed. I instead had to do this:
```
event.set(k, v.to_f) if k.start_with? 'metric-'
```
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [November 4, 2022, 4:23am UTC](https://discuss.elastic.co/t/regex-to-integer-float/54333/6 "2022-11-04T04:23:48Z")