document backreference to regex conditional

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-merge-1.4.x@620 152afb58-edef-0310-8abb-c4023f1b3aa9

doc/lighttpd.conf

@@ -254,6 +254,10 @@ static-file.exclude-extensions = ( ".php", ".pl", ".fcgi" )
 #### url handling modules (rewrite, redirect, access)
 #url.rewrite                = ( "^/$"             => "/server-status" )
 #url.redirect               = ( "^/wishlist/(.+)" => "http://www.123.org/$1" )
+#### both rewrite/redirect support back reference to regex conditional using %n
+#$HTTP["host"] =~ "^www\.(.*)" {
+#  url.redirect            = ( "^/(.*)" => "http://%1/$1" )
+#}
 
 #
 # define a pattern for the host url finding

doc/redirect.txt

@@ -34,3 +34,6 @@ url.redirect
     url.redirect = ( "^/show/([0-9]+)/([0-9]+)$" => "http://www.example.org/show.php?isdn=$1&page$2",
                      "^/get/([0-9]+)/([0-9]+)$"  => "http://www.example.org/get.php?isdn=$1&page$2" )
 
+    $HTTP["host"] =~ "^www\.(.*)" {
+      url.redirect = ( "^/(.*)" => "http://%1/$1" )
+    }

doc/rewrite.txt

@@ -51,3 +51,7 @@ query-string.::
 
   url.rewrite-once = ( "^/id/([0-9]+)$" => "/index.php?id=$1",
                        "^/link/([a-zA-Z]+)" => "/index.php?link=$1" )
+
+  $HTTP["host"] =~ "^([^.]+)\.(this-is-mass-vhost\.com)" {
+    url.rewrite-once = ( "^/(.*)" => "/%2/%1/$1" )
+  }