ACL based on incoming URI value

Hi Folks,

Currently I’m in need of route the traffic based on incoming URI Value…

For Example, below is the incoming URI value

In this, A123456P9876 value from the above URI, I need to capture the 123456 which is in between of A & P & then I need to make ACL to forward to particular backends based on the manipulated number

I’m fine in setting the header after taking 123456 & capture the header and write ACL also, but I need someway to achieve this.

Is this possible in any way… Please help me