Nginx sites+alias+rewrite for laravel4

blog.conf

server {

        listen 80 default_server;
        root /opt/html;
        index index.php index.html;
        rewrite_log on;

        location / {
                rewrite ^(/.*?\.php)(/.*)?$ /...$document_root/.../...$1/...$2 last;
        }

        set $blog_dir /opt/www/blog/public;
        set $blog_prefix /blog;
        set $blog_log /var/log/nginx/blog.error.log;

        location /blog {
                autoindex on;
                alias $blog_dir;
                if ( $uri !~ ^/blog/(docs|assets|robots\.txt|favicon\.ico|assets) ) {
                    rewrite ^(/blog)(/.*)?$ /...$document_root/...$blog_prefix/...$2 last;
                }
                error_log $blog_log notice;
        }

        location /... {
                internal;
                autoindex off;
                location ~ ^/\.\.\.(?<p_doc_root>.*)/\.\.\.(?<p_prefix>.*)/\.\.\.(?<p_pathinfo>.*)$ {
                        fastcgi_pass unix:/var/run/php5-fpm.sock;
                        fastcgi_index index.php;
                        include fastcgi_params;
                        fastcgi_param SCRIPT_FILENAME $p_doc_root/index.php;
                        fastcgi_param SCRIPT_NAME     $p_prefix/index.php;
                        fastcgi_param REQUEST_URI     $p_prefix$p_pathinfo$is_args$query_string;
                        fastcgi_param DOCUMENT_URI    $p_prefix$p_pathinfo;
                        fastcgi_param DOCUMENT_ROOT   $p_doc_root;
                        fastcgi_param PATH_INFO       $p_pathinfo if_not_empty;
                }
        }
}