Lighttpd and sub directories

I have URL like :

http://example.com/dir1/...
http://example.com/dir2/...
http://example.com/dir3/...

and I would like to retrieve the dir1, dir2, dir3... (they are not real directories) in a DIR_NUMBER environment variable :

$HTTP["host"] == "example.com" {
  $HTTP["url"] =~ "^/(.*)/" {
    setenv.add-environment = ( "DIR_NUMBER" => $1)

    url.rewri开发者_如何转开发te-once = (
      "^/(.*)" => "/index.php/$1" 
    )
  }

It does not work, any idea ? Is it possible ?

Thanks.

You need to use url.redirect instead of url.rewrite-once if it's not a real file which the webserver is trying to access.