iRule subdirectory to hostname with URI

I am using subdirectories,

I would like to go from:

subdirectory "/catpics" to redirect to "; which is easy, but I want anything following /catpics to go as well.

ex: http(s)://myhost.com/catpics/baddog to go to ";

or http(s)://myhost.com/catpics/baddog/puppies to go to ";

I do not want it to go to "; - that would be easy

How do I eliminate the "catpics" from [HTTP::uri]

Thanks!