Wildcards

You can specify wildcards in topic names. For each actual topic, the server uses logical AND to combine all the selectors that match the topic.

Note: However, routing of topic messages is only reliably supported when the subscriber's topic is a subset (or equal) of the configured global topic. Similarly, intersections are not supported. For example, if topics.conf contains foo.* and foo.a*, the following subscriptions are correct: 
foo.*
foo.1
bar.a.b

The following subscriptions are not correct: 

foo.>
bar.*.b