用正则截取字符串

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          <td  align="center" class="zi_06">　申请号</td>
          <td height="26" align="center" class="zi_06">　费用金额</td>
   <td  align="center" class="zi_06">　费用种类</td>
          <td  align="center" class="zi_06">　挂号号</td>
          <td  align="center" class="zi_06">　收据号</td>
          <td  align="center" class="zi_06">缴费人信息</td>
          <td  align="center" class="zi_06">处理状态</td>
          <td  align="center" class="zi_06">缴费日</td>
          <!--td  align="center" class="zi_06">收据发文日</td-->
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        <tr onMouseOver="this.className='td-over'" onMouseOut="this.className='td-out'">
  <td height="27" class="dixian1" align="center">　200680045295.8</td>
          <td height="27" class="dixian1" align="center">　1200</td>
          <td height="27" class="dixian1" align="center">　发明专利第6年年费</td>
          <td height="27" class="dixian1" align="center">　</td>
          <td height="27" class="dixian1" align="center">　21508346</td>
          <td height="27" class="dixian1" align="center">　北京信慧永光知识产权代理有限责任公司</td>
          <td height="27" class="dixian1" align="center">　处理结束</td>
          <td height="27" class="dixian1" align="center">　2011.09.20</td>
          <!--td height="27" class="dixian1" align="center">　2011.09.23</td-->
        </tr>
        
        <tr onMouseOver="this.className='td-over'" onMouseOut="this.className='td-out'">
  <td height="27" class="dixian1" align="center">　200680045295.8</td>
          <td height="27" class="dixian1" align="center">　250</td>
          <td height="27" class="dixian1" align="center">　发明专利登记印刷费</td>
          <td height="27" class="dixian1" align="center">　</td>
          <td height="27" class="dixian1" align="center">　16053488</td>
          <td height="27" class="dixian1" align="center">　上海专利商标事务所有限公司</td>
          <td height="27" class="dixian1" align="center">　处理结束</td>
          <td height="27" class="dixian1" align="center">　2010.03.29</td>
          <!--td height="27" class="dixian1" align="center">　2010.03.31</td-->
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  <td height="27" class="dixian1" align="center">　200680045295.8</td>
          <td height="27" class="dixian1" align="center">　1200</td>
          <td height="27" class="dixian1" align="center">　发明专利第4年年费</td>
          <td height="27" class="dixian1" align="center">　</td>
          <td height="27" class="dixian1" align="center">　16053488</td>
          <td height="27" class="dixian1" align="center">　上海专利商标事务所有限公司</td>
          <td height="27" class="dixian1" align="center">　处理结束</td>
          <td height="27" class="dixian1" align="center">　2010.03.29</td>
          <!--td height="27" class="dixian1" align="center">　2010.03.31</td-->
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        <tr onMouseOver="this.className='td-over'" onMouseOut="this.className='td-out'">
  <td height="27" class="dixian1" align="center">　200680045295.8</td>
          <td height="27" class="dixian1" align="center">　5</td>
          <td height="27" class="dixian1" align="center">　印花税</td>
          <td height="27" class="dixian1" align="center">　</td>
          <td height="27" class="dixian1" align="center">　16053488</td>
          <td height="27" class="dixian1" align="center">　上海专利商标事务所有限公司</td>
          <td height="27" class="dixian1" align="center">　处理结束</td>
          <td height="27" class="dixian1" align="center">　2010.03.29</td>
          <!--td height="27" class="dixian1" align="center">　2010.03.31</td-->
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        <tr onMouseOver="this.className='td-over'" onMouseOut="this.className='td-out'">
  <td height="27" class="dixian1" align="center">　200680045295.8</td>
          <td height="27" class="dixian1" align="center">　1200</td>
          <td height="27" class="dixian1" align="center">　发明专利第5年年费</td>
          <td height="27" class="dixian1" align="center">　</td>
          <td height="27" class="dixian1" align="center">　17225389</td>
          <td height="27" class="dixian1" align="center">　北京信慧永光知识产权代理有限责任公司</td>
          <td height="27" class="dixian1" align="center">　处理结束</td>
          <td height="27" class="dixian1" align="center">　2010.09.20</td>
          <!--td height="27" class="dixian1" align="center">　2010.09.21</td-->
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      <font class='contents'>　页次：</font><font class='contents'>2</font><font class='contents'>/2页</font>
      <font class='contents'>　共有 15 条收费信息
      <font class='contents'>　转到第：</font><input type='text' name='page' size=5 maxlength=10 class=smallInput value="2">页  
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怎么截取“发明专利第n年年费”这样的字符串？？先行谢谢！