What's the easiest way to get the string between the parentheses in the following string:

Code:
RPM|Cabinet - Tall -  -Notch (18.000H x 1.500W) - Black - Edge: Black
In this example the returned string should be "18.000H x 1.500W". The parts inside & outside the parentheses can be different each time & different lengths.
I would think you could do this with regex, but I couldn't get it to work. Thanks...