Google Analytics Advanced Filter Question

I want to pull out 2 directories only in Google Analytics to compare them. Can we do that? What is the proper code?

| Source / Medium | Matching RegEx | ^(bing / cpc | adcenter / cpc)$

This does not work. I am trying to pull out bing / cpc and adcenter / cpc and compare only these two on one screen.

Thanks to anyone that tries to help!