iRule for redirecting requests

We have vip on port 80 with default pool having all members(on different ip addresses) on port 80.

Now we have requirement like this when following HTTP::uri comes on this vip it should do :

/api/channel* - go to channel pool having all members on port 8088

/api/space* - go to space pool having all members on port 8089

/api/gateway* - go to gateway having all members on port 8087

Now all these subsystems(different ports) are on the same ip address

vip 192.168.159.131 on port 80

default pool members - 192.168.159.133:80 , 192.168.159.134:80

channel pool members - 192.168.159:133:8088 , 192.168.159:134:8088

space pool members - 192.168.159:133:8089 , 192.168.159:134:8089

gateway pool members - 192.168.159:133:8087 , 192.168.159:134:8087

Now we have to design a iRule like this if from default pool 192.168.159.133 is picked then all other subsystem requests should go to this ip address only and not to 192.168.159.134.

Can anybody provide a way to design this iRule.

Thanks.