正则表达式怎么写！

HTML code

 <div class="game_introduce">       <div class="info bg_bor">        <strong>阿萨德：</strong>    <div class="howto">            <ul>         <li><span class="i_mouseleft">mouseleft</span>阿萨德</li>  </ul>         </div>          <p>发生的</p></div>     

我要得到里面的中文跟span里面的数据 我该怎么写正则

[解决办法]
中文： [\u4e00-\u9fa5]+

span数据： (?i)(?<=<span[^>]*?>)[^<>]+(?=</span>)
[解决办法]

C# code

            StreamReader reader = new StreamReader("c:\\1.txt",Encoding.Default);            string source = reader.ReadToEnd();            Regex reg = new Regex(@"(?is)([\u4e00-\u9fa5]+)|((?<=<span[^>]*?>).*?(?=</span>))");            MatchCollection mc = reg.Matches(source);            foreach (Match m in mc)            {                MessageBox.Show(m.Value);            }
[解决办法]
C# code
string html = @" <div class=""game_introduce"">       <div class=""info bg_bor"">        <strong>阿萨德：</strong>    <div class=""howto"">            <ul>         <li><span class=""i_mouseleft"">mouseleft</span>阿萨德</li>  </ul>         </div>          <p>发生的</p></div>     ";            foreach (var r in Regex.Matches(html, @"(?<=<span.*?\>)(.*?)(?=\</\s*?span\s*?\>)(.*?)\<\/li\>").Cast<Match>()) {                string spanval = r.Groups[1].Value;                string 中文 = r.Groups[2].Value;            }
[解决办法]
(?i)(?<=<span\sclass="game_introduce"[^>]*?>)[^<>]+(?=</span>)
[解决办法]
        StreamReader reader = new StreamReader("c:\\1.txt",Encoding.Default);
           string source = reader.ReadToEnd();
           Regex reg = new Regex(@"(?is)([\u4e00-\u9fa5]+)|((?<=<span[^>]*?>).*?(?=</span>))");
           MatchCollection mc = reg.Matches(source);
           foreach (Match m in mc)
           {
               MessageBox.Show(m.Value);
           }
[解决办法]
你可以匹配表达式，用协议就可以得到值，但不科学。
[解决办法]
  string html = @"
  <div class=""game_introduce"">
      <div class=""info bg_bor"">
       <strong>阿萨德：</strong>
   <div class=""howto"">
           <ul>
        <li><span class=""i_mouseleft"">mouseleft</span>阿萨德</li>  </ul>
        </div>
         <p>发生的</p>
</div>    
";
           foreach (var r in Regex.Matches(html, @"(?<=<span\s*class\=""i_mouseleft""\s*\>)(.*?)(?=\</\s*?span\s*?\>).*?([^\>]*?)\<\/li\>").Cast<Match>())
           {
               string spanval = r.Groups[1].Value;
               string 中文 = r.Groups[2].Value;
           }
------解决方案-------------------- 
 
(?is)<div\s*[^>]*?class="game_introduce"[^>]*?>.*<span\s*[^>]*?>([^<>]+?)(?=</span>)