Alright, new question.

What characters are valid in Perl for separating different types of PATH_INFO URL parameters? For example, if I want to state that the support board frontpage should display threads 4 and 15-7 (reverse order), with the last five replies of each thread and each post abbreviated to the first 20 lines, I could type something like:

http://wakaba.c3.cx/sup/4,15-7:l5:1-20/

Replace the colons with whatever valid characters can be used for this separation. Is there any way that could work?