mod rewrite help

[Acers]

hey guys, need a bit of help. Due to a change in my server, the vb easy archive hack urls have changed a bit.

Right now my forum view url is

http://www.techenclave.com/forums/search/forum.php/54-1.html

while earlier it was
http://www.techenclave.com/forums/search/forum/54-1.html

and topic view now is

http://www.techenclave.com/forums/search/topic.php/4848-1.html

while earlier it was
http://www.techenclave.com/forums/search/topic/4848-1.html

notice the .php changes. Unfortunately all search engines have the old urls cached. So i need to do a redirect for them

i did this which is not working... so plz suggest what to add.. (i am noob in mod rewrite )

rewriteEngine ON 
RewriteCond %{REQUEST_URI} ^/search/forum/$  [NC]
RewriteRule ^/search/forum/$   /search/forum.php/ [R=301,L]