How to configure a LRT file for CIC based routing?

All of the examples that I have found for creating a LRT file reference using a user type of "E164" with a regex replacement used as the R-URI for the next-hop. As in:

<route>

<user type="E164">10000</user>

<next type="regex">!(^.*$)!sip:\1@nexthop.com!</next>

</route>

The documentation references using local routing table lookups to route on the CIC key in the R-URI.  Do these lookups also use the same format, or is there a different user type that should be used?

An example would be helpful.

David