# Wildcard in expected result values

**URL:** <https://forum.alumio.com/t/wildcard-in-expected-result-values/2301>\
**Category:** General\
**Created:** [August 22, 2025, 10:03am UTC](https://forum.alumio.com/t/wildcard-in-expected-result-values/2301 "2025-08-22T10:03:47Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![tommy](https://forum.alumio.com/letter_avatar_proxy/v4/letter/t/b5a626/32.png) [@tommy](https://forum.alumio.com/u/tommy)\
**Post date:** [August 22, 2025, 10:03am UTC](https://forum.alumio.com/t/wildcard-in-expected-result-values/2301/1 "2025-08-22T10:03:47Z")

</div>

I want to validate if a field with a datetime exists. What do I write in the “expected result” field? Is there some kind of wildcard? Is this documented somewhere?

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<div class="post-metadata">

**Author:** ![r.candrian](https://forum.alumio.com/user_avatar/forum.alumio.com/r.candrian/32/235_2.png) [@r.candrian](https://forum.alumio.com/u/r.candrian)\
**Post date:** [August 22, 2025, 11:11am UTC](https://forum.alumio.com/t/wildcard-in-expected-result-values/2301/2 "2025-08-22T11:11:54Z")

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Hi @tommy , could you please provide us with more context or the transformer that you already used?

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<div class="post-metadata">

**Author:** ![tommy](https://forum.alumio.com/letter_avatar_proxy/v4/letter/t/b5a626/32.png) [@tommy](https://forum.alumio.com/u/tommy)\
**Post date:** [August 22, 2025, 11:58am UTC](https://forum.alumio.com/t/wildcard-in-expected-result-values/2301/3 "2025-08-22T11:58:05Z")

</div>

I want to test a transformer which creates following output;

```auto
{
  "datetime": "2025-08-22 12:07:36.388257"
}

```

So in the test, I want to validate if the key datetime exists. But the value is variable.

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<div class="post-metadata">

**Author:** ![r.candrian](https://forum.alumio.com/user_avatar/forum.alumio.com/r.candrian/32/235_2.png) [@r.candrian](https://forum.alumio.com/u/r.candrian)\
**Post date:** [August 25, 2025, 12:22pm UTC](https://forum.alumio.com/t/wildcard-in-expected-result-values/2301/4 "2025-08-25T12:22:42Z")

</div>

Unfortunately, that’s not possible. When using the “Expected” feature, you need to define the exact Key and Value.

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<div class="post-metadata">

**Author:** ![catalin](https://forum.alumio.com/user_avatar/forum.alumio.com/catalin/32/1428_2.png) [@catalin](https://forum.alumio.com/u/catalin)\
**Post date:** [August 26, 2025, 9:17am UTC](https://forum.alumio.com/t/wildcard-in-expected-result-values/2301/5 "2025-08-26T09:17:00Z")

</div>

> [@tommy](#):
>
> ```auto
> {
> "datetime": "2025-08-22 12:07:36.388257"
> }
> 
> ```

Either use a conditional to check the valid date time  
Or validate it with a regex.  
In this case **validDatetime** is defined false before the validation.

 ![image](https://alumio-forum.s3.dualstack.eu-central-1.amazonaws.com/uploads/original/2X/7/7885ad44b7bfc3613dbdaac1e90312404e4aa8cf.png)