public static string GetYouTubeUserChannelId(this string str)
{
if (str == null)
{
return(null);
}
var match = YouTubeUserChannelIdRegex.Match(str);
if (!match.Success || match.Groups["id"].Captures.Count != 1)
{
return(null);
}
return(match.Groups["id"].Captures[0].Value);
}
public static bool IsValidYouTubeUserChannelUrl(this string str)
{
return(YouTubeUserChannelIdRegex.IsMatch(str));
}