用C# 正则 提取HTML标签中的值？

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Text.RegularExpressions;
namespace ConsoleApplication5{ class Program { static void Main(string[] args) { string s = @"<tr><td font=red>2009-1-2</td><td font=red>200</td><td>110</td></tr>
<tr><td>2009-1-3</td><td>200</td><td>110</td></tr>
<tr><td font=blue>2009-1-4</td><td>200</td><td>110</td></tr>";
string st = RegStr(s); Console.WriteLine(st); Console.ReadLine();
}
public static string RegStr(string objStr) { string returnStr = ""; MatchCollection ml = Regex.Matches(objStr, "<tr>.*?</tr>"); foreach (Match m in ml) { string str = m.Value.Replace("</td></tr>", ","); str = str.Replace("</td>", "|"); str = Regex.Replace(str, "<.*?>", ""); returnStr += str; } return returnStr; } }}