This feature is available in Ultimate edition only.
You can use tags to filter regression tests when assigning them to specific regression suites. Multiple tags can be defined for any item. When entering tags:
Use the [space bar] to separate tags
Press [Tab] to go to the next field
Special characters are allowed in tags, acting as term separators when using the tag filter, so 'role:mgr' is effectively the same as two tags of 'role' and 'mgr' from a tag filtering perspective. Note, however, that special characters might cause unexpected results within the Find field and Advanced Search.