Is the ! (exception) subscription filter ?

Hi @Robert,

Thanks for highlighting this topic. Maybe there's a case here to be made for topic subscription exceptions to be explained and highlighted more across our documentation.
They are indeed supported for the cases mentioned (guaranteed messaging use cases).
But not supported for direct messaging use cases as detailed in the docs under the second link you provided.

I didn't get what you meant by this comment:

So from what i read is likely not mentioned as it does not work in all cases.
Is that assumption correct ? Additional you have to enable to use that capability.

Subscription exceptions are enabled by default according to the docs. Did you experience something different?

As well i assume you can only exclude or include the entire topic:
order/AP/*/CUST => all customer orders in region asia pasific
!order/AP/CN/CUST => exclude chinese orders from region AP

Problem with that is that as not everywhere supported in case of not being able to use the only alternative would be to list any country in region asia pacific except of CN.
That will add administrative complexity.

Your example is correct, without subscription exceptions you would have to fine tune your subscriptions a lot more in the above example. With subscription exceptions, you can more easily exclude a single value, like CN in this example. That is what they are used for.
You can also use wildcards in your subscriptions exceptions, if you need to exclude a wider range of topics.

Thanks @Robert, I'll raise this with our docs team to see, if we can pepper a few more mentions across our doc pages.