Stick to pool even if subsequent URI does not match

I have a need with a 3rd party product to initially match on "/sites/" in the URI but then on subsequent requests the URI may not have "/sites/" in it.

 

 

However if I select a hyperlink that is the root "/" or 5 other key words I need to goto another pool.

 

 

Can anyone get me started with a hilevel design and iRules?