ACS Commons StaticReferenceRewriteTransformerFactory.cfg.json

I have an issue with matchingPatterns not working. I am trying to rewrite pdf links <a href="/content/dam/whatever.pdf"> links 
into <a href="http://satic.dev.mysite.com/content/dam/whatever.pdf">. The config file below doesn't work for matchingPatterns, but everything else works.
I tried a ton of different things and can't seem to get that attribute to do anything. I tried acs commons 5.3.4, 5.7.0, 6.1.0. Any clues?


com.adobe.acs.commons.rewriter.impl.StaticReferenceRewriteTransformerFactory.cfg.json


{
  "host.pattern":[
    "static.dev.mysite.com"
  ],
  "attributes":[
    "img:src",
    "link:href",
    "script:src"
  ],
  "matchingPatterns":[
    "a:href;(\/content\/(.*?)\\.pdf)"
  ],
  "host.scheme":"http",
  "prefixes":[
    "/etc.clientlibs",
    "/etc",
    "/libs",
    "/content"
  ],
  "pipeline.type":"mysite-static-refs"
}