Using the Rally Rest API for CRUD operations

Question

At my company, we recently started using Rally for our project management tool. Initially, someone external to our team invested a lot of time manually creating iterations using a naming convention that is just not going to jive with our team's existing scheme. Instead of asking this poor soul to delete these empty iterations by hand, one by one, I would like to automate this process using Rally's REST API. In short, we need to delete these 100+ empty iterations which span across 3 different projects (which all sharing a common parent).

I have spent some time looking at the rally-rest-api ruby gem, and although I have some limited Ruby experience, the Query interface of the API remains confusing to me, and I am having some trouble wrapping my head around it. I know what my regex would like, but I just don't know how to supply that to the query.

Here is what I have so far:

require 'rubygems'
require 'rally_rest_api'

rally = RallyRestAPI.new(:username => "myuser", 
                         :password => "mypass")
regex = /ET-VT-100/    
# get all names that match criteria
iterations  = rally.find(:iteration) { "query using above regex?" }
# delete all the matching iterations
iterations.each do |iteration|
  iteration.delete    
end

Any pointers in the right direction would be much appreciated. I feel like I'm almost there.