using MDX to Query lists of Member Names

Is there a way (using MDX) to query member names from a dimension by
providing some criteria?

I Think I've seen (in passing) someone using custom VB functions in
Dlls to accomplish something like this...

Here is a sample Scenario
given a dimension  (and level), return a list of member names that meet
some criteria.

something like: give me all members of dimension "A", Level "Manager"
containing "joe" (as a substring)...