Zend certified PHP/Magento developer

How can I write a formula to conditional format cells that contain two ampersands anywhere within the cell?

I have a long list of names, most of which contain an ampersand (&). Some contain two ampersands at various places within the cell. I need to conditionally format the cells (just highlight them) in order to find them. I haven’t been able to find a formula that can identify and condition a cell that contains two ampersands.