Update: go for the simplest regex possible...
1 $HTTP["host"] =~ "awesomerailsapp.com" {
2 server.error-handler-404 = "/dispatch.fcgi"
3 server.document-root = "/awesomerailsapp/public/"
4 url.redirect = (
5 "^/feed/atom" => "http://awesomerailsapp.com/xml/atom/feed.xml",
6 "^/feed" => "http://awesomerailsapp.com/xml/rss/feed.xml",
7 "^/wp-rss2\.php" => "http://awesomerailsapp.com/xml/rss/feed.xml",
8 "^/wp-atom\.php" => "http://awesomerailsapp.com/xml/atom/feed.xml",
9
10 "^/(\d{4})/(\d{2})/(\d{2})/([\w-_]+)" => "/articles/$1/$2/$3/$4"
11 )
12
13
14 }