iRule to redirect based on path plus fallback host

I'm not super on iRules but need to write one that will redirect path A and B to pool1 and path C and D to pool2. I also need to incorporate a fallback host in case each of these pools don't have a member. I've come up with the following iRule. Can anyone tell me whether or not this is a sound iRule or if there is anything better I should write?

 

 

 

 

when HTTP_REQUEST {

 

 

switch -glob -- [string tolower [HTTP::path]] {

 

 

 

"/a*" -

 

"/b*" {

 

if {[active_members pool_1] < 1} {

 

Log and direct the client to Maintenance pool

 

log local0. "!!Maintenance page called for Pool1!!"

 

pool Fallback_Pool }

 

else {

 

pool pool_1

 

}

 

 

 

"/c*" -

 

"/d*" {

 

if {[active_members pool_2] < 1} {

 

Log and direct the client to Maintenance pool

 

log local0. "!!Maintenance page called for Pool2!!"

 

pool Fallback_Pool }

 

else {

 

pool pool_2

 

}

 

 

default { discard }

 

 

 

}

 

}