Restricted characters

Topics are identified by a path. A path is made up of path segments separated by the slash character (/).

Each path segment can be made up of one or more Unicode characters. The slash character (/) is not permitted in any path segment.

Recommendations

Although all Unicode characters except the slash character (/) are supported, we recommend avoiding common regular expression metacharacters such as '*' and '?' in path names to avoid having to quote these characters in topic selector expressions.