redirect ID numbers to sub domain

www.mydomain.com/1233.html this is开发者_运维百科 the main topic which we have in the website and i need remove my script from this site and who ever will enter this link will be redirected to the link below

myprogram.mydomain.com/v2/1233.html

what is the process on doing so and the setup required for the file below ? .htaccess

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The following should be put in your document root. Uncomment the first line if you want it to match www.example.com only, and not example.com or myprogram.example.com

#RewriteCond %{HTTP_HOST} ^www\.example\.com$
RewriteRule ^/(\d+\.html)$ http://myprogram.example.com/v2/$1 [L]