# Delete value from filed in recursive way
**URL:** https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088
**Category:** Logstash
**Created:** [January 11, 2022, 10:06pm UTC](https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088 "2022-01-11T22:06:28Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@INS](https://discuss.elastic.co/u/INS)
#### Post date: [January 11, 2022, 10:06pm UTC](https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088/1 "2022-01-11T22:06:28Z")
Hi
I need to remove from a few fields in the recursive way some value so I've tried in two steps but without success, can You check what's wrong
**input data:**
```auto
"ue_stat" => "undefined-undefined",
"s_gw" => "122.123.205.100-undefined",
"psm_info2_lte" => "undefined-undefined",
"psm_info_lte" => "undefined-undefined-undefined-undefined"
```
================================
```auto
ruby {
code => "
hash = event.to_hash
hash.each do |k,v|
if v == 'undefined-'
event.remove(v)
end
end
"
}
ruby {
code => "
hash = event.to_hash
hash.each do |k,v|
if v == '[-]*undefined'
event.remove(v)
end
end
"
}
```
---
### Author:  [@INS](https://discuss.elastic.co/u/INS)
#### Post date: [January 12, 2022, 11:37am UTC](https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088/2 "2022-01-12T11:37:48Z")
today I've tried also the new one code but get the same result. I don't know where the is the root cause.
```auto
ruby {
code => "
def stripit(value)
value.gsub!('[-]*undefined','')
value
end
hash = event.to_hash
hash.each do |k,value|
if value == '[-]*undefined'
stripit(value)
end
end
"
}
ruby {
code => "
def stripito(value)
value.gsub!('undefined-','')
value
end
hash = event.to_hash
hash.each do |k,value|
if value == 'undefined-'
stripito(value)
end
end
"
}
```
---
### Author:  [@INS](https://discuss.elastic.co/u/INS)
#### Post date: [January 12, 2022, 12:52pm UTC](https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088/3 "2022-01-12T12:52:31Z")
also this approach doesn't work
```auto
ruby {
code => "
hash = event.to_hash
hash.each do |k,v|
if v == '[-]*undefined'
event.set(k, v.gsub!('[-]*undefined',''))
end
end
"
}
ruby {
code => "
hash = event.to_hash
hash.each do |k,v|
if v == 'undefined-'
event.set(k, v.gsub!('undefined-',''))
end
end
"
}
```
@Badger Can You keep an eye? on this -\>
Do You have any idea? Please note that all these fields are strings
---
### Author:  [@INS](https://discuss.elastic.co/u/INS)
#### Post date: [January 12, 2022, 1:46pm UTC](https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088/4 "2022-01-12T13:46:26Z")
> [@INS](#):
>
> `event.set(k, v.gsub`
I found that the problem can be in regex but the same one regex works in
```auto
mutate {
gsub => ["ue_stat","undefined-",""]
}
mutate {
gsub => ["ue_stat","[-]*undefined",""]
}
```
if we put it into this method (event.set) there is a problem. But logstash doesn't spit out any bugs.
---
### Author:  [@INS](https://discuss.elastic.co/u/INS)
#### Post date: [January 13, 2022, 2:44pm UTC](https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088/5 "2022-01-13T14:44:29Z")
ok now it's clear ruby has a problem with regex so I user another method
" Using include? method from string"
```
ruby {
code => "
hash = event.to_hash
hash.each do |k,v|
if v.is_a? String
if v.include? 'undefined-'
event.set(k, v.gsub!('undefined-',''))
end
end
end
"
```
}
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [February 10, 2022, 2:45pm UTC](https://discuss.elastic.co/t/delete-value-from-filed-in-recursive-way/294088/6 "2022-02-10T14:45:28Z")
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