Convert Youtube Url to Video Flash Url Asp.Net MVC

Question

I am using Microsoft Web Helpers in my application and using

@Video.Flash(path: "http://www.youtube.com/v/o3mP3mJDL2k", width: "200", height: "200")

to embed a youtube url.

The actual url to the youtube video is

http://www.youtube.com/watch?v=o3mP3mJDL2k

I was wondering if there is any utily or regex to convert the above url to the embed url format(/v/) ?

if other members are embedding videos in their website , i am curious to know how they are doing this.

Thanks