正则采集问题，求解，在线等

Question

目标页：http://www.weather.com.cn/weather/101070101.shtml查看其网页源码，想得到425行的数据，即“今天是2013年10月16日 星期三 农历九月十二”和621行“沈阳天气预报 (2013-10-16 18:00发布)" 和641行～765行之间主要数据。用图表示一下，见下图：
另外我自己写的一条规则，试着取了下这样的数据"沈阳天气预报 (2013-10-16 
          11:00发布)"但输入后为空数组，求指导！多谢！

Answer 1

1
$s=file_get_contents('http://www.weather.com.cn/weather/101070101.shtml');
preg_match('/<h1 class="weatheH1"  id="live">\s+(.+)\s+<\!--today5-->/s',$s,$m);
echo $m[1];2
 preg_match('/<div class="weatherYubao"  id="7d">\s+<h1 class="weatheH1">\s+(.+?)\s+<span>/s',$s,$m);
echo $m[1];3 不知道你想要得到什么格式的数据。

Answer 2

如下源码：
<!--day 1-->
          <table class="yuBaoTable" width="100%" border="0" cellspacing="0" cellpadding="0">
          <tr>
            <td width="15%" rowspan="2" class="t0" style="background:#f4f7fc;"><a title="农历九月十二">16日星期三</a></td>
            <td width="12%" style="background:#f4f7fc;">白天</td>
            <td width="10%">
              <a href="http://www.weather.com.cn/static/html/legend.shtml" target="_blank">
                <img src="/m2/i/icon_weather/29x20/d00.gif" />
              </a>
            </td>
            <td width="18%"><a href ="http://baike.weather.com.cn/index.php?doc-view-767.php" target="_blank">晴</a></td>
            <td width="15%">
              <a href="http://baike.weather.com.cn/index.php?doc-view-1148.php" target="_blank">
                <b>高温 <strong>12℃</strong></b>
              </a>
            </td>
            <td width="15%">
              <a href="http://baike.weather.com.cn/index.php?doc-view-778.php" target="_blank">
                东北风
              </a>
            </td>
            <td width="15%">
              <a href="http://baike.weather.com.cn/index.php?doc-view-778.php" target="_blank">
                微风
              </a>
            </td>
          </tr>
          <tr>
            <td style="background:#f4f7fc;">夜间</td>
            <td>
              <a href="http://www.weather.com.cn/static/html/legend.shtml" target="_blank">
                <img src="/m2/i/icon_weather/29x20/n00.gif" />
              </a>
            </td>
            <td><a href ="http://baike.weather.com.cn/index.php?doc-view-767.php" target="_blank">晴</a></td>
            <td>
              <a href="http://baike.weather.com.cn/index.php?doc-view-1386.php" target="_blank">
                <span>低温 <strong>-2℃</strong></span>
              </a>
            </td>
            <td>
              <a href="http://baike.weather.com.cn/index.php?doc-view-778.php" target="_blank">
                东北风
              </a>
            </td>
            <td>
              <a href="http://baike.weather.com.cn/index.php?doc-view-778.php" target="_blank">
                微风
              </a>
            </td>
          </tr>
          </table>
          <!--day 2-->
只想要（取得3天数据）：16日星期三 白天：晴 12℃ 东北风微风 夜间：晴 -2℃ 东北风微风

Answer 3

echo preg_replace('/&nbsp;\s+/s','',$result[1]);3
preg_match_all('/<table class="yuBaoTable" width="100%" border="0" cellspacing="0" cellpadding="0">(.+)<\/table>/isU',$s,$m);
 echo join('<br>',array_map('strip_tags',array_slice($m[1],0,3)));

Answer 4

哦，写错了。第一个应该是 echo preg_replace('/&nbsp;\s+/s','',$result2[1]);

Answer 5

这两行执行后，还有个小缺陷，有很多不必要的换行存在，能弄掉吗？（查看源代码如下）
今天是2013年10月17日 星期四 农历九月十三
  
沈阳天气预报 (2013-10-1708:00发布)
          
            17日星期四
            白天
            
              
                
              
            
            晴
            
              
                高温 16℃
              
            
            
              
                西南风
              
            
            
              
                微风
              
            
          
          
            夜间
            
              
                
              
            
            晴
            
              
                低温 3℃
              
            
            
              
                西南风
              
            
            
              
                微风
              
            
          
          <br>
          
            18日星期五
            白天
            
              
                
              
            
            晴
            
              
                高温 18℃
              
            
            
              
                西南风
              
            
            
              
                3-4级
              
            
          
          
            夜间
            
              
                
              
            
            多云
            
              
                低温 6℃
              
            
            
              
                西南风
              
            
            
              
                3-4级
              
            
          
          <br>
          
            19日星期六
            白天
            
              
                
              
            
            阵雨
            
              
                高温 15℃
              
            
            
              
                西南风
              
            
            
              
                3-4级
              
            
          
          
            夜间
            
              
                
              
            
            多云
            
              
                低温 4℃
              
            
            
              
                西南风
              
            
            
              
                微风
              
            
          
          

Answer 6

 echo preg_replace('/\s+/s','',join('<br>',array_map('strip_tags',array_slice($m[1],0,3))));

Answer 7

换行是去掉了，但全边一起了
沈阳天气预报 (2013-10-1711:00发布)17日星期四白天晴高温16℃西南风微风夜间晴低温3℃西南风微风<br>18日星期五白天晴高温18℃西南风3-4级夜间多云低温6℃西南风3-4级<br>19日星期六白天阵雨高温15℃西南风3-4级夜间多云低温4℃西南风微风
有办法让换行变成一个空格吗（现有的<br>保留）？

Answer 8

echo preg_replace('/\s+/s',' ',join('<br>',array_map('strip_tags',array_slice($m[1],0,3))));