How to get a subdomain in LIGHTTPD and pass it through RewriteRule?

Question

Lighttpd

How to get a subdomain in the LIGHTTPD server config and pass it through the RewriteRule. The site is located in the same folder, you need an implementation like http://(name).site.ru , but you need to rewrite http://site.ru/(name)/ .

$HTTP["host"] =~ ".*\.сайт.ру" {

    url.rewrite-if-not-file = (
"^(.*)$" => "сайт.ру/index.php?имя=$1",
)}

but, accordingly, such a rule does not work to get the name of the subdomain ....