Unable to regex on aggregation filter input box

[yishagerew (Yishagerew Yitaih)]

I have the following metrics from a aws service: api-name-404, api-name-406, api-name-501,api-name-500.
I wrote the aggregation filter query using regex. But since I want to show 5xx and 4xx errors in same graph, I have used a sum bucket aggregation.
In order to filter out all 5xx errors under same bucket and used in a filter, I tried using this in the box like this: metric.name:api-name-5 but this doesn't work as it expect a full text match, and doesn't filter all 5xx errors.
I tried several options to use a regex but looks impossible in the filter box for filters aggregation.

I have wrote a query filter to retrieve all the 5xx errors as follows and this works.

But as I showed in the first figure, I can't use a regex to filter all class of 5xx errors under same filter. I can only show either 500 or 501 or so.

Any idea how to achieve the same?

[Marius_Dragomir]

This is because what you're using in the top filter that you edited is Query DSL while the Filters in aggregation uses KQL. 5* should work if the field is set to keyword afaik. Since you only have those 4 values I highly recommend just using AND/ OR in order to make the queries faster.