正则表达式用来匹配a标签中的title。返回的值只有title。
怎么写
谢谢

string resultHtml = getHtml("http://bbs.csdn.net/topics/391047173");
//获取a标签中href
//string regexHref = @"(?is)[^'""]*)[^<]*";
//获取a标签中title
string regexHrefTitleInA2 = @"(?=";
var matches = Regex.Matches(resultHtml, regexHrefTitleInA2);

            foreach (Match item in matches)
            {
                 if (item.Success)
                 {
                    Console.WriteLine(item.Value);
                 }
                 Console.WriteLine();
            }


        Console.Read();