describe Blah do
  describe "#lol"
    it "should make lols" do
    end

    it "should make it rain" do
    end
  end
end

# Assuming "spec" is the name of the directory holding the specs

rspec -e "Blah#lol" spec  # Runs all the #lol tests under Blah
rspec -e "Blah#lol*rain" spec # Runs only the rain test