c# - C# regex capture gets two results instead of one

Question

I want to check whether an URL matches a pattern like: http://the.site.com/some/path/1234567 and simultaneously extract the last number from it.

If I do this so:

Match m = Regex.Match(url, "^http://the.site.com/some/path/(?<picid>.*?)$");
if (m.Success)
{
    log(string.Format("New download. Id={0}", m.Groups["picid"].Value));
}

it returns 2 groups. One contains http://the.site.com/some/path/1234567, the other 1234567. How to change the regex to get only one capture - the number?

Answer 1

You can use the regex flag RegexOptions.ExplicitCapture

Usage :

Regex.Match(url, "^http://the.site.com/some/path/(?<picid>.*?)$", RegexOptions.ExplicitCapture);

Answer 2

By your example you need to check if the string match and get the last digit from the string in your example is 7 do this:

            Match m = Regex.Match(url, @"^http://the.site.com/some/path/\d+$");
            if (m.Success)
            {
                int y = int.Parse(m.Value[m.Value.Length - 1].ToString());
            }

Answer 3

The Following Regex should capture only the number...

(?<=http://the.site.com/some/path/)(?<picid>.*?)$