Is there any wildcard support in the RTM search?

I'd like to search for partial tags. I'm using tags to support the idea of projects (among other things). All my project tags start with '+' character, for example +cleanthegarage. I'd like to be able to find all project-related tasks with a search like:

tag:^\+.*

(find all tasks with a tag that starts with a '+', depending on how you choose to implement regular expressions)

Other searches would be nice too, like:

tag:.*clean.*

...to match any task with a tag containing the substring "clean".

Is there any wildcard / regular expression support like this in RTM?

Building Smart Lists with wildcards / regular expressions would be nice too.

Thanks, Mike