todo: turn into a css vars filter plugin
Quick and dirty limited implementation of css Variables in Java
http://disruptive-innovations.com/zoo/cssvariables/
http://trac.webkit.org/browser/trunk/LayoutTests/fast/css/variables
Based on the popular and very useful mod_rewrite for apache, UrlRewriteFilter is a Java Web Filter for any J2EE
compliant web application server (such as Resin or Tomcat), which allows you to rewrite URLs before they get to your
code.
The idea for UrlRewriteTestCase is that users can extend it to create their own
simple unit tests instead of having to manually setup a mock request and the filter.
Implements a regex like interface on top of WildcardMatcher, this is really just a convinience class
so that it's easier for us to program against regex and wildcard patterns.