string
s = ".......";

string
r = @"(?s)(?i)导演：\s*</span>\s*<span\s+class=""m_c"">\s*<span><a.*?>(?<director>.*?)</a>";

string
t = Regex.Match(s, r).Groups["director"];

Console.WriteLine(t);

// (?s) 点号匹配一切字符（含换行符）

// (?i) 进行不区分大小写的匹配

// (?<name>...) 命名捕获

            Regex r = new
Regex("(?s)(?i)id=\"__VIEWSTATE\" value=\"(?<__VIEWSTATE>[^\"]+)\" />.+"
+

                "<span id=\"lbinfo\">(?<lbinfo>[^<]+)</span>.+"
+

                "<span id=\"lbIP\">(?<lbIP>[^<]+)</span>.+"
+

                "<span id=\"lbuserid\">(?<lbuserid>[^<]+)</span>.+"
+

                "<span id=\"lbRealName\">(?<lbRealName>[^<]+)</span>.+"
+

                "<span id=\"lbRemainMoney\">(?<lbRemainMoney>[^<]+)</span>.+"
+

                "<span id=\"lbFreshTime\">(?<lbFreshTime>[^<]+)</span>.+"
+

                "<span id=\"LNowState\">(?<LNowState>(开放|关闭)IP成功).+</span>.+"
+

                "id=\"__EVENTVALIDATION\" value=\"(?<__EVENTVALIDATION>[^\"]+)\" />", RegexOptions.Compiled);