# If condition list in field

**URL:** <https://discuss.elastic.co/t/if-condition-list-in-field/321886>\
**Category:** Logstash\
**Created:** [December 23, 2022, 8:00am UTC](https://discuss.elastic.co/t/if-condition-list-in-field/321886 "2022-12-23T08:00:40Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![mikhatanu](https://avatars.discourse-cdn.com/v4/letter/m/ba8739/32.png) [@mikhatanu](https://discuss.elastic.co/u/mikhatanu)\
**Post date:** [December 23, 2022, 8:00am UTC](https://discuss.elastic.co/t/if-condition-list-in-field/321886/1 "2022-12-23T08:00:40Z")

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hello, is it possible to do a searching of a list in field? e.g.

```auto
filter{
    if ["a","b","c","d"] in [message]{
        mutate{
            add_field=>{"new_field"=>"%{message}"}
        }
    }
}

```

i want the "new\_field" to be added only if at least 1 of the string in list appeared in field.

---

<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:** [December 23, 2022, 6:02pm UTC](https://discuss.elastic.co/t/if-condition-list-in-field/321886/2 "2022-12-23T18:02:43Z")

</div>

No, but you can use alternation in a regexp

```
if [message] =~ /(a|b|c|d/ {

```

---

<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:** [January 20, 2023, 6:03pm UTC](https://discuss.elastic.co/t/if-condition-list-in-field/321886/3 "2023-01-20T18:03:26Z")

</div>

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