Wildcard in expected result values

General
1

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?

2

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

3

I want to test a transformer which creates following output;

{
  "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.