求一个正则表达式

Question

html格式如下，要求可以同时匹配下面3种情况，这样我可以通过循环来获得所有td的内容了 
1. <td>      Approaching  </td> 
2. <td> </td> 
3. <td> <a href="asdfsadf">Dakhla </a>  </td> 
谢谢了 最后一个td比较特殊，需要的内容在 <a>的title上，如果可以的话，也麻烦写一个正则表达式 <tr > 
                <td> 
                    Approaching 
                    
                    
                    
                
                </td> 
                <td> </td> 
                <td> 
                    
                        
                        <a 
                                href="/lmiu/places/sightings.htm?placeID=5304">Dakhla </a> 
                        
                    
                </td> 
                <td>75.2 </td> 
                <td>15 Sep 2008 18:46 </td> 
                <td>15 Sep 2008 18:46 </td> 
                    
                <td> 
                    
                        
                        <a 
                                href="/lmiu/places/sightings.htm?placeID=3903">BONNY.NIGERIA </a> 
                        
                    
                </td> 
                <td>27 Sep 2008 </td>                 
                    
                    
                        <td> <a id="0_ais__tt_link" class="tooltip_link" 
                              href="#0_ais__tt_link" 
                              title="GMT From: 15 Sep 2008 18:46 To: 15 Sep 2008 18:46 
      <br/>COG: 208 SOG: 8.3 Draft: 
      <br/>Updates #: 1 
      <br/>Latitude: 24?8'14''N 
      <br/>Longitude: 17?'0''W">details </a> </td> 
                            </tr> 
        

Answer 1

1，2 
public static string[] GetRegBeteenString(string body)
{
Regex re=new Regex(@"<td>(?<Text>.*)</td>", RegexOptions.IgnoreCase);
MatchCollection mcoll=re.Matches(body);
ArrayList slist=new ArrayList();
foreach(Match m in mcoll)
{
string reslut=m.Result("${Value}");
if(reslut!="")
{
if(!slist.Contains(reslut))
slist.Add(reslut);
}
}
return (string[])slist.ToArray(typeof(string));
}

Answer 2

3.
<td>\s{0,}<a[^<>]*title=\"?(?<title>[^<>]*)\"?.*>.*</td>