How do I convert these rewrite rules to be compatible with Nginx?

RewriteRule ^mangas/([^/]+)/([^/]+)/$ - [F,L]
RewriteRule ^mangas/([^/]+)/$ - [F,L]
RewriteRule ^mangas(/?)$ - [F,L]

RewriteRule ^([^/.]+)/([^/.]+)/([0-9]+)(/?)$ index.php?manga=$1&chapter=$2&page=$3 [L]
RewriteRule ^([^/.]+)/([^/.]+)(/?)$ index.php?manga=$1&chapter=$2 [L]
RewriteRule ^([^/.]+)(/?)$ index.php?manga=$1 [L]

Any help will be appreciated. Thanks much.