# How to exclude key value pair from KV filter if Key size greater than 15 char

**URL:** https://discuss.elastic.co/t/how-to-exclude-key-value-pair-from-kv-filter-if-key-size-greater-than-15-char/269566
**Category:** Logstash
**Created:** [April 8, 2021, 9:04am UTC](https://discuss.elastic.co/t/how-to-exclude-key-value-pair-from-kv-filter-if-key-size-greater-than-15-char/269566 "2021-04-08T09:04:28Z")
**Posts on this page:** 1
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<div class="post-metadata">

### Author: ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)
#### Post date: [April 8, 2021, 3:49pm UTC](https://discuss.elastic.co/t/how-to-exclude-key-value-pair-from-kv-filter-if-key-size-greater-than-15-char/269566/2 "2021-04-08T15:49:19Z")

</div>

The kv filter cannot do that for you, you would have to use a ruby filter. I have not tested it but something like

```
ruby {
    code => '
        event.to_hash.each { |k, v|
            if k.length > 15
                event.remove(k)
            end
        }
    '
}
```

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