Full site in SSL with exception of knowledged path in lighttpd

gistfile1.txt

# When http then https but no redirect for "knowledgebase" path
$HTTP["scheme"] == "http" {
        $HTTP["host"] =~ "secure.site.com" {
                url.redirect = ( "^/(?!(knowledgebase).*)" => "https://secure.site.com/$1" )
                server.document-root            = "/site/secure"
        }
}
#behavior for SSL 
$HTTP["scheme"] == "https" {
        $HTTP["host"] =~ "^secure\.site\.com" {
                ssl.engine                      = "enable"
                server.document-root            = "/site/secure"
                server.max-keep-alive-idle      = 3
        }
#if "knowledgebase" is accessed from inside of the SSL site then exit to http!
        $HTTP["url"] =~ "knowledgebase" {
                setenv.add-environment = ( "HTTPS" => "off" )
                ssl.engine              = "disable"
                url.redirect = ( "^/(.*)" => "http://secure.site.com/$1" )
        }
}