PMDF System Manager's Guide

The $, %, and @ characters are normally metacharacters in rewrite rule templates. To insert a literal such character, quote it with a dollar character, $. I.e., $$ expands to a single dollar sign, $; $% expands to a single percent, % (the percent is not interpreted as a template field separator in this case); and $@ expands to a single at sign, @ (also not interpreted as a field separator).