请教一个正则的问题。

Question

现在有一组HTML：<a href="show.php?hash=asdfasfe23edsadf" target="_blank"><span style="color:red;font-weight:bold;">asdasdfasdfsad</span></a>
<a href="show.php?hash=223rwefdsv" target="_blank"><span style="color:red;font-weight:bold;">asdaew32</span></a>
<a href="show.php?hash=sdefqwtg5423" target="_blank"><span style="color:red;font-weight:bold;">sdfasv534</span></a>
<a href="show.php?hash=23123rfsadfd" target="_blank">asfasdc312</a>
<a href="show.php?hash=sagdbh54537564" target="_blank">asdfasv23312</a>
<a href="show.php?hash=asgdhgnetr4231" target="_blank"><span style="color:red;font-weight:bold;">agfeh43</span></a>
<a href="show.php?hash=awdfsagr424354" target="_blank"><span style="color:red;font-weight:bold;">ujk6454</span></a>
<a href="show.php?hash=23123rswefds" target="_blank">3435gdsds</a>
...如上面，有的A标签中还包含SPAN，有的不包含。我现在想用正则取出标签里的值。请问正则该如何写。谢谢。。正则

Answer 1

(?is)(?<=<a)[^<>]+(?=>)  取不包含span的

Answer 2

  <tr class="alt1 text_center" onmouseover="highlight(this, 'alt1');">
    <td nowrap="nowrap">09/02 17:29</td>
    <td><a href="index.aspx?sort_id=36">流行</a></td>
    <td class="text_left">
<img src="images/put_top.gif" alt="置顶" title="置顶" align="absmiddle" />&nbsp;
<a href="show.aspx?hash=758dc94e56956b6e4cc78d12d1bb07a7af38217f" target="_blank">
<span style="color:red;font-weight:bold;">东风破</span></a>
</td>
    <td nowrap="nowrap"><span class="bts_1">12</span></td>
    <td nowrap="nowrap"><span class="btl_1">75</span></td>
    <td nowrap="nowrap"><span class="btc_1">7010</span></td>
  </tr>
    <tr class="alt1 text_center" onmouseover="highlight(this, 'alt1');">
    <td nowrap="nowrap">09/02 17:29</td>
    <td><a href="index.aspx?sort_id=37">流行</a></td>
    <td class="text_left">
<img src="images/put_top.gif" alt="置顶" title="置顶" align="absmiddle" />&nbsp;
<a href="show.aspx?hash=315dc94e56956b6e4cc78d12d1bb07a7af38217f" target="_blank">菊花台</a>
</td>
    <td nowrap="nowrap"><span class="bts_1">12</span></td>
    <td nowrap="nowrap"><span class="btl_1">75</span></td>
    <td nowrap="nowrap"><span class="btc_1">7010</span></td>
  </tr>例如是上面的这种，我想取出东风破，菊花台这2条，应该用什么正则？

Answer 3

(?i)<a\b[^>]*?>(?:<span[^>]*?>)?([^<>]+)(?:</span>)?</a>不论有没有span都可以取到
要取m.Groups[1].Value

Answer 4

string pattern=@"(?is)(?<=<td\s*class=""text_left"">.*?<a[^>]*?href=[""'])[^""']+(?=[""'])";

Answer 5

(?i)<a\b[^>]*?>(?:\s*<span[^>]*?>)?([^<>]+)(?:</span>\s*)?</a>

Answer 6

我试了一下，没SPAN的可以取到，有SPAN的取不到。