正則表達式,急!!
現需用正則表達式從以下html中取出id為documentContainer的table中td里面的值.
<html>
<div class="content" id="content" style="overflow:auto;width:100%;">
<table width="640" border="0" cellpadding="5" cellspacing="1" bgcolor="#EAEAEA">
<tbody><tr>
<td width="73" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">货币名称</td>
<td width="73" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">现汇买入价</td>
<td width="73" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">现钞买入价</td>
<td width="73" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">现汇卖出价</td>
<td width="73" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">现钞卖出价</td>
<td width="73" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">人民币汇率中间价</td>
<td width="73" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">中行折算价</td>
<td width="110" align="center" valign="middle" bgcolor="#EFEFEF" class="lan12_hover">发布时间</td>
</tr>
</tbody>
</table>
<table id="documentContainer">
<tbody><tr>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20">新西兰元</td>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20">513.87</td>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20"></td>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20">518</td>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20"></td>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20"></td>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20">514.07</td>
<td width="110" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20">2012-03-07 11:31:28</td>
</tr>
<tr>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20">英镑</td>
<td width="73" align="center" valign="middle" bgcolor="#FFFFFF" class="hui12_20">989.53</td>
<td width="73" align="center" valign="middle&