URL routing-rewrite issue

[eluser]Animas[/eluser]
I think here I should use URI Routing. Now I want to show post links(which I have set) like www.domain.com/blog/post/12/My-post-title! to www.domain.com/My-post-title! .

I guess i should put some regular expressions inside route.php. But can't figure out the exact expression. I want "My-post-title!" to call "blog/post/12/My-post-title!".

I set

Code:

$route['([a-z]+)/(\d+)'] = "blog/post/$1";

but it is not working. (I am not good at regex)

Any suggestion?