正则表达式匹配问题

正则表达式匹配html元素的时候，正则表达式字符串，和源字符串都不要Server.HtmlEncode() 编码了，直接匹配

1.html 内容如下：

C#代码如下：

Server.HtmlEncode
        string s1, s2, s3, s4;

        FileStream fs = new FileStream(Server.MapPath("1.htm"), FileMode.Open);

        StreamReader sr = new StreamReader(fs);
        string str = sr.ReadToEnd();
        sr.Dispose();

        string fliter_name = "(?<= <a id=\"tbl_tr_name_qt_1\" href=\"http://shanghai.anjuke.com/shop/view/316462\" class=\"aTrueName\" target=\"_blank\" >)[\\s\\S]*"+"(?=</a>)"; //不要编码
        string fliter_company = "(?<=<div class=\"divCompanyStore\" id=\"tbl_tr_cpn_qt_1\">)[\\s\\S]*?[^<](?=</div>)"; //不要编码
        string fliter_phone = "(?<=<div class=\"divUserMobile\" id=\"tbl_tr_mb_qt_1\">)[\\s\\S]*?(?=</div>)"; //不要编码

        string fliter_area = "(?<=<div class=\"divArea\" id=\"tbl_tr_area_qt_1\">)[\\s\\S]*?(?=</div>)"; //不要编码
        Match name = Regex.Match(str, fliter_name);//直接匹配，下面的也是，这样就能匹配到
        Match company=Regex.Match(str,fliter_company);
        Match area=Regex.Match(str,fliter_area);
       Match phone = Regex.Match(str,fliter_phone);

       s1 = name.Value;
       s2 = company.Value;
       s3 = area.Value;
       s4 = phone.Value;

       Response.Write(s1+s2+s3+s4);