apache - 書き換え: Apache から Nginx へ

Question

nginxの次のルールを変換する方法を教えてもらえますか?

RewriteRule ^([^/]*)/?$ index.php?a=$1 [L,NC]
RewriteRule ^([^/]*)/([^/]*)/?$ index.php?a=$1&b=$2 [L,NC]
RewriteRule ^([^/]*)/([^/]*)/([^/]*)/?$ index.php?a=$1&b=$2&c=$3 [L,NC]

Answer 1

http://wiki.nginx.org/HttpRewriteModule#rewrite