I have the following apache rule running fine. I need help in implementing this rule in
the nginx script below, or, an alternative nginx script ......

All help greatly appreciated ....
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Apache
RewriteRule product_details/([a-zA-Z0-9_-]+)$/(.*).html /product_details.php?id=$1

My existing nginx conf
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server {
listen 80;
server_name domainname.com;
rewrite ^(.*) http://www.domainname.com$1 permanent;
}
server {
listen 80;
server_name www.domainname.com;
access_log /var/log/nginx/domainname.com.access.log;
location / {

index index.htm index.html index.php;
root /var/www/domainname.com;
if ( !-e $request_filename ) {
rewrite (/|\.php|\.html|\.htm|\.feed|\.pdf|\.raw|/[^.]*)$ /index.php last;
break;
}
}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
location ~ \.php$ {
fastcgi_param SCRIPT_FILENAME /var/www/domainname.com/$fastcgi_script_name;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param QUERY_STRING $query_string;
fastcgi_param REQUEST_METHOD $request_method;
fastcgi_param CONTENT_TYPE $content_type;
fastcgi_param CONTENT_LENGTH $content_length;
fastcgi_param SCRIPT_NAME $fastcgi_script_name;
fastcgi_param REQUEST_URI $request_uri;
fastcgi_param DOCUMENT_URI $document_uri;
fastcgi_param DOCUMENT_ROOT $document_root;
fastcgi_param SERVER_PROTOCOL $server_protocol;
fastcgi_param GATEWAY_INTERFACE CGI/1.1;
fastcgi_param SERVER_SOFTWARE nginx;
fastcgi_param REMOTE_ADDR $remote_addr;
fastcgi_param REMOTE_PORT $remote_port;
fastcgi_param SERVER_ADDR $server_addr;
fastcgi_param SERVER_PORT $server_port;
fastcgi_param SERVER_NAME $server_name;
}
}