正则提取红色部分内容
<td height="30" align="center" valign="middle" bgcolor="#FFFFFF"><a href="displayproduct.html?proID=3364178" target="_blank">Phenylethanolamine A ELISA Test Kit</a></td>
<td align="center" valign="middle" bgcolor="#FFFFFF">96 wells/kit</td>
<td align="center" valign="middle" bgcolor="#FFFFFF">Negotiable</td>
<td align="center" valign="middle" bgcolor="#FFFFFF">Shenzhen,China</td>
<td align="center" valign="middle" bgcolor="#FFFFFF"><input type="checkbox" name="proID" value="3364178" /></td>
</tr>
<tr>
<td height="30" align="center" valign="middle" bgcolor="#FFFFFF"><a href="displayproduct.html?proID=3364170" target="_blank">Cyproheptadine ELISA Test Kit</a></td>
<td align="center" valign="middle" bgcolor="#FFFFFF">96 wells/kit</td>
<td align="center" valign="middle" bgcolor="#FFFFFF">Negotiable</td>
<td align="center" valign="middle" bgcolor="#FFFFFF">Shenzhen, China</td>
<td align="center" valign="middle" bgcolor="#FFFFFF"><input type="checkbox" name="proID" value="3364170" /></td>
</tr>
<tr>
<td height="30" align="center" valign="middle" bgcolor="#FFFFFF"><a href="displayproduct.html?proID=3357975" target="_blank">Swine Mycoplasma ELISA test kit</a></td>
<td align="center" valign="middle" bgcolor="#FFFFFF">96 wells/kit</td>
<td align="center" valign="middle" bgcolor="#FFFFFF">Negotiable</td>
<td align="center" valign="middle" bgcolor="#FFFFFF">China</td>
<td align="center" valign="middle" bgcolor="#FFFFFF"><input type="checkbox" name="proID" value="3357975" /></td>
[解决办法]
(?i)(?<=<td[^>]*>\s*<a\shref=(['"]?))[^'"]+?(?=\1)
