public static string GetFacebookVideoId(this string str)
{
if (str == null)
{
return(null);
}
var match = FacebookVideoIdRegex.Match(str);
if (!match.Success || match.Groups[1].Captures.Count != 1)
{
return(null);
}
return(match.Groups[1].Captures[0].Value);
}
// Extension methods
public static bool IsValidFacebookVideoUrl(this string str)
{
return(FacebookVideoIdRegex.IsMatch(str));
}
