100分求个思路或是正则表达式什么的,请进!

Question

  Regex reg = new Regex(@"(?is)<a[^>]*?href=(['""\s]?)(?<href>[^'""\s]*)\1[^>]*?>");

Answer 1

http://blog.csdn.net/flying881114/article/details/6609546

Answer 2

为什么一定要用正则呢？xpath简单明了
下面的演示代码，使用了开源类库Html Agility Packusing System;
using HtmlAgilityPack;namespace com58
{
class Program
{
const string html = @"<tr logr=""p_0_23219080775431_18974112972167_0"">
                    <td class=""img""><a target=""_blank"" href=""http://ny.58.com/ershoufang/18974112972167x.shtml"">
                        <img alt="""" src=""http://pic7.58cdn.com.cn/p1/tiny/n_s02391407514652158114.jpg"" /></a>
                     </td>
                    <td class=""t"">
                        <a href=""/ershoufang/?key=邓州"" target=""_blank"" class=""t1"">[二手房]</a><span class=""hg"">-</span>
                        <a href=""http://ny.58.com/ershoufang/18974112972167x.shtml"" target=""_blank"" class=""t"" title=""性价比极高的个人房源出售"">性价比极高的个人房源出售
                        </a>
                        <span class='ico biz'>（个人）</span>                    <span class='ico ntu' title=''>[8图]</span>
                        <span name=""zaixian_23219080775431""></span>
                        <br />
                        <p class=""sub"">个人房源。…就医上学…升值空间大，户型设计合理，…看房请提前预约.</p>
                        <p class=""abt"">
                            <a href=""/dengzhou/ershoufang/"">邓州</a><span> - </span>
                            <!-- 房产信息中二手房和租房在商圈后增加显示小区 -->
                            <a href=""/ershoufang/jh_超高性价比的"">超高性价比的</a><span> - </span>
                            今天
                        </p>
                    </td>
                    <td class=""pd"" style=""width: 15%"">2室(94)
                    </td>
                    <td class=""pd01"" style=""width: 15%"">
                        <b class='pri'>25</b> 万
                    </td>
                </tr>                <tr logr=""p_1_18191348468486_19099111543554_0"">
                    <td class=""img""><a target=""_blank"" href=""http://ny.58.com/ershoufang/19099111543554x.shtml"">
                        <img alt="""" src=""http://pic8.58cdn.com.cn/p1/tiny/n_s12407409337043876114.jpg"" /></a></td>
                    <td class=""t"">
                        <a href=""/ershoufang/?key=邓州"" target=""_blank"" class=""t1"">[二手房]</a><span class=""hg"">-</span>
                        <a href=""http://ny.58.com/ershoufang/19099111543554x.shtml"" target=""_blank"" class=""t"" title=""盛世龙源39万 84平米 2房 毛坯 西南户，罕点房源"">盛世龙源39万 84平米 2房
                        </a>
                        <span class='ico ntu' title=''>[4图]</span>
                        <span name=""zaixian_18191348468486""></span>
                        <br />
                        <p class=""sub"">       4 非常罕点 ，有需求的尽快联系，出手极快，目前仍有不同楼层其它…
                        </p>
                        <p class=""abt"">
                            <a href=""/dengzhou/ershoufang/"">邓州</a><span> - </span>
                            <!-- 房产信息中二手房和租房在商圈后增加显示小区 -->
                            <a href=""/ershoufang/jh_盛世龙源"">盛世龙源</a><span> - </span>
                            今天
                        </p>
                    </td>
                    <td class=""pd"" style=""width: 15%"">2室(84)
                    </td>
                    <td class=""pd01"" style=""width: 15%"">
                        <b class='pri'>39</b> 万
                    </td>
                </tr>";
const string path = "//tr/td[1]/a/@href";

public static void Main(string[] args)
{
Extract();
Console.Write("Press any key to continue . . . ");
Console.ReadKey(true);
}

public static void Extract()
{
HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
doc.LoadHtml(html);
HtmlNode root = doc.DocumentNode; HtmlNodeCollection nodes = root.SelectNodes(path);
if (null != nodes) {
for (int i = 0; i < nodes.Count; ++i) {
Console.WriteLine(string.Format("href: {0}", nodes[i].GetAttributeValue("href", "")));
}
}
}
}
}

Answer 3

这个很简单，几句代码就可以了，楼主看下是这样吗？
使用一个正则表达式就可以直接提取出所有结果了，不需要其他处理代码，这边已经写好完整的代码了，复制粘贴就可以使用：
http://www.hellocsharp.com/ask/24.aspx

Answer 4

结完贴感觉有点不对,这个是抓取所有的<a href="http:> 
不过虽然有点粗心,但是还是很感谢你!