How to get specific value from Regex match grouping in C#

Question

I'm working on getting the screen_name and tweetid from the Twitter urls based on the regular expression group matching.

(http(s)?:\/\/)(?:www.)?twitter\.com\/@?(#!\/)?(?<screenname>[a-zA-Z0-9_]{1,15})(?:\/status(?:es)?\/)?(?<tweetid>\d+)?

I was able to get the Twitter screen_name and tweetid on the following links:

• https://twitter.com/IMDb/status/1044665597026594817
• https://twitter.com/BeastsMovieUK?lang=en
• http://www.twitter.com/@BeastsMovieUK

However, I could not get the correct screen_name and tweetid on the following links:

• http://www.twitter.com/i/web/status/1044713346405023744
• https://twitter.com/intent/user?screen_name=tyrabanks

I tried some changes on the regular expression but failed to make it works on the above links.

This are the codes I used to process this the regular expression.

Regex test = new Regex(@"(http(s)?:\/\/)(?:www.)?twitter\.com\/@?(#!\/)?(?<screenname>[a-zA-Z0-9_]{1,15})(?:\/status(?:es)?\/)?(?<tweetid>\d+)?", RegexOptions.Compiled | RegexOptions.IgnoreCase);
var matches = test.Matches("https://twitter.com/BeastsMovieUK/status/1042682155590197248");
Match m = null;
if (matches.Count > 0)
{
    foreach (Match match in matches)
    {
        if (match.Groups["tweetid"].Success)
        {
            m = match;
            Console.WriteLine("tweetid: {0}", m);
            break;
        }

        if (match.Groups["screenname"].Success)
        {
            m = match;
            Console.WriteLine("screenname: {0}", m);
        }
    }
}
Console.WriteLine("tweetid result: {0}", m.Groups["tweetid"]);
Console.WriteLine("screenname result: {0}", m.Groups["screenname"]);

This is my working sample: https://dotnetfiddle.net/wPoCSY

Answer 1

If your two URL's are always going to be in the same format you could always just use Split on them. Here's a working example:

https://dotnetfiddle.net/Dda0if