如何.htaccess重定向文件名为新域名的url参数？

Question

I want to be able to redirect url such as subdomain.domain.com/426/long-tail-kw.html to new domain and url such as differentdomain.com/goodname.php?id=long-tail-kw

Also, the number in the url 426 will change often, it could also be 1 or whatever number up to 500

How can I do this in .htaccess file?

Also, the redirect must work with this code that sends the people who come from bing ONLY to the new url. If a person just enters the url then he will not be redirected but when he comes from bing or from whatever specified referrer then he will be redirected.

Thus far I have this code that I used for my old site that had cat-x in the url but I don't know how to change the code to work with only a number in the url instead of cat-x

 RewriteEngine On
 RewriteCond %{HTTP_REFERER} (bing)
 RewriteCond %{HTTP_HOST} ^(?:www\.)?server10\.olddomain\.com$ [NC]
 RewriteRule ^cat-\d+/(.+?)\.html$ http://newdomain.com/go.php?id=$1 [L,QSA,R=302]

Answer 1

Just remove the cat- part:

 RewriteEngine On
 RewriteCond %{HTTP_REFERER} (bing)
 RewriteCond %{HTTP_HOST} ^(?:www\.)?server10\.olddomain\.com$ [NC]
 RewriteRule ^\d+/(.+?)\.html$ http://newdomain.com/go.php?id=$1 [L,QSA,R=302]