Today i had to write a quick method to extract the YouTube video id from a YouTube video URL. So on with the show, lets get onto the code.

private string GetYouTubeID(string youTubeUrl)
{
    //Setup the RegEx Match and give it 
    Match regexMatch = Regex.Match(youTubeUrl, "^[^v]+v=(.{11}).*", 
                       RegexOptions.IgnoreCase);
    if (regexMatch.Success)
    {
        return "http://www.youtube.com/v/" + regexMatch.Groups[1].Value + 
               "&hl=en&fs=1";
    }
    return youTubeUrl;
}