string[] abc = new string[] { "news", "/news", "/news/", "/news/abc", "/news/abcdew/", "/news/abcd/test.aspx", "/news/add/abc.jpb", "/news/wew/news/" };

            Regex reg = new Regex(@"(?<=news/)[^/]+");

            foreach (string s in abc)

                Console.WriteLine(reg.Match(s).Value);

var abc = new string[] { "news", "/news", "/news/", "/news/abc", "/news/abcdew/", "/news/abcd/test.aspx", "/news/add/abc.jpb", "/news/wew/news/" };



            for (int i = 0; i < abc.Length; i++)

            {



                Console.WriteLine(Regex.Match(abc[i], @"(?<=/news/)\w*(?=/?)"));

            }

            /*

             结果：

             abc

             abcdew

             abcd

             add

             wew

            */

Regex reg = new Regex(@"^.*news\/([^\/]+)\/?.*$");

 Console.WriteLine(M.Groups[1].Value);

            string[] str = new string[] { "news", "/news", "/news/", "/news/abc", "/news/abcdew/", "/news/abcd/test.aspx", "/news/add/abc.jpb", "/news/wew/news/" };

            foreach (string s in str)

            {

                Match match = Regex.Match(s, "/news/(?:.)+", RegexOptions.IgnoreCase);

                Console.WriteLine(match.Value);

            }



///news/abc

///news/abcdew/

///news/abcd/test.aspx

///news/add/abc.jpb

///news/wew/news/

            List<string> list = new List<string> { "/gz", "/", "/gz?a=23", "/gz/abc.aspx", "/gz/abc.aspx?id=23", "/job/", "/job/?abc=233", "/job#top", "/job/?abc=233#top" };

            Regex reg = new Regex(@"(?<=/)[^#?/]+");

            foreach (string s in list)

                Console.WriteLine(reg.Match(s).Value);