# Does Logstash support wilcards for multiple empty fields

**URL:** <https://discuss.elastic.co/t/does-logstash-support-wilcards-for-multiple-empty-fields/270948>\
**Category:** Logstash\
**Created:** [April 22, 2021, 10:17am UTC](https://discuss.elastic.co/t/does-logstash-support-wilcards-for-multiple-empty-fields/270948 "2021-04-22T10:17:22Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![stillfreem](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stillfreem/32/85628_2.png) [@stillfreem](https://discuss.elastic.co/u/stillfreem)\
**Post date:** [April 22, 2021, 10:17am UTC](https://discuss.elastic.co/t/does-logstash-support-wilcards-for-multiple-empty-fields/270948/1 "2021-04-22T10:17:23Z")

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Hello,

I know that in Logstash I can check if a field is empty with the following  
`if ![myfield] { do something }`

Having said that I though that wildcards will match all fields that are empty but that was not the case.  
Does somebody know how to match any field that is empty and not just a single one?  
For instance i don't know which fields will be empty and I try to fill them all with a dummy value

Thank you in advance.

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<div class="post-metadata">

**Author:** ![stillfreem](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stillfreem/32/85628_2.png) [@stillfreem](https://discuss.elastic.co/u/stillfreem)\
**Post date:** [April 22, 2021, 10:30am UTC](https://discuss.elastic.co/t/does-logstash-support-wilcards-for-multiple-empty-fields/270948/2 "2021-04-22T10:30:59Z")

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Also say I don't want to chase after empty fields but ones that contains a pipe (|)?

I read on the internet that ruby code is my answer but I don't do Ruby 🙂 Could you please paste some code that will help to do what I want?

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<div class="post-metadata">

**Author:** ![stillfreem](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/stillfreem/32/85628_2.png) [@stillfreem](https://discuss.elastic.co/u/stillfreem)\
**Post date:** [April 22, 2021, 12:20pm UTC](https://discuss.elastic.co/t/does-logstash-support-wilcards-for-multiple-empty-fields/270948/3 "2021-04-22T12:20:17Z")

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Found it using ruby 🙂  
If you're field is null substitute "|" with nil, or if your field is not empty but blank then substitute "|" with empty string ""

```
ruby {
        code => '
            event.to_hash.each { |k, v|
                if v == "|"
                    event.set(k, "N/A")
                end
            }
        '
    }
```

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [May 20, 2021, 12:20pm UTC](https://discuss.elastic.co/t/does-logstash-support-wilcards-for-multiple-empty-fields/270948/4 "2021-05-20T12:20:21Z")

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