求一正则谢夫妇

Question

已知 <a href="http://www.abc.com/asdasdadadsadadas?html?id=sdada2342423" target="_blank" class="c1" id="ds">
class是唯一的，id不唯一，现在想匹配出http://www.abc.com/asdasdadadsadadas?html?id=sdada2342423，谢了

Answer 1

string s = @"<a href=""http://www.abc.com/asdasdadadsadadas?html?id=sdada2342423"" target=""_blank"" class=""c1"" id=""ds"">";
MatchCollection matches = Regex.Matches(s, @"(?is)(?<=<a[^>]+href=([""'])).+?(?=\1[^>]*class=""c1""[^>]*>)");
foreach (Match match in matches)
Response.Write(match.Value + "<br/>");

Answer 2

var regex = new Regex(@"(?is)<a[^>]+href=(['""])?(?<link>[^'"]*)\1[^>]+?class=""c1""[^>]+>");
var s = regex.Match(str).Groups["link"].Value;

Answer 3

我改成这样
Regex reg1= new Regex(@"(?is)(?<=<a[^>]+href=([""'])).+?(?=\1[^>]*class=""c1""[^>]*>)");
        string mubiao = "";
       if(reg1.IsMatch(SourCode))
                      {
                            Match mshang = regshang.Match(SourCode);
                            mubiao = mshang.Groups[1].Value;
                         }
怎么不行呢

Answer 4

mubiao = mshang.Groups[1].Value;
改成
mubiao = mshang.Value;