Slick-C has a lot of docs. It's best to look at sample Slick-C code and see if anything looks like a good start for you. If you do a multi-file search on "_proc_search(" in the macros directory, you will see a lot of existing examples. antlr_proc_search() is a good simple one. asm_proc_search() is a bit more involved but does illustrate searching for many different kinds of definitions.
Usually a regex is defined to look for the start some possible definitions. Match groups are often used for various pieces of the symbol because they are easy to fetch. Then the tag structure is filled in and inserted into the current context. This is the general idea anyway.
