choosing POOL by inspecting uri string

Hi,

 

i'm looking for an i-rule that choose the pool (among three) by catching in the uri string an exact word;

 

the HW is big-ip 5000 with BIG-IP Kernel 4.5.9 Build2

 

I already try this but i failed:

 

 

if (http_uri contains "word-1") {

 

use pool POOL-1

 

}

 

else {

 

if (http_uri contains "word-2") {

 

use pool POOL-2

 

}

 

else {

 

use pool POOL-3

 

}

 

}