C#正则匹配

            String s = "asdasdadadasd<span></span><embed  src='1'/><embed  src='2'/><embed  src='3'/><img src='4'/>";            Regex reg = new Regex(@"(?is)(?<=embed[\s]+src=')[^<>]+(?='\/\>)");
            MatchCollection ms = reg.Matches(s);
            foreach (Match match in ms)
            {
                MessageBox.Show(match.Value);
            }