Writing "URI Pattern"

I did a lot of search on google regarding writing "URI Pattern" to read links/requests, but couldn't find anything good. Can anybody point me to some good materials on writing "URI Pattern".

FYI - This is to configure tRESTRequest component in Talend ESB

For example

The REST Endpoint is or URI location where REST-ful web service will be accessible for requests : "http://192.168.0.235:8088/user"

For reading this request: "http://192.168.0.235:8088/user/1" the "URI Pattern" is "/{id}/"

For reading this request: "http://192.168.0.235:8088/user/number?string=123" the "URI Pattern is "/number"