php正则匹配html中带class的div并选取其中内容的方法

<div class="chartInfo">   <div class="line"></div> <div class="tideTable">       <strong>潮汐表</strong>数据仅供参考     <table width="500" border="0" cellspacing="0" cellpadding="0">         <tbody>            <tr>                 <td width="100"><p><span>潮时 (Hrs)</span></p></td>               <td width="100"><p>00:58</p></td>             <td width="100"><p>05:20</p></td>             <td width="100"><p>13:28</p></td>             <td width="100"><p>21:15</p></td>            </tr>              <tr>                 <td><p><span>潮高 (cm)</span></p></td>               <td width="100"><p>161</p></td>               <td width="100"><p>75</p></td>               <td width="100"><p>288</p></td>               <td width="100"><p>127</p></td>              </tr>         </tbody>     </table>      <h2>时区：-1000 (东10区)  潮高基准面：在平均海平面下174CM</h2>         </div>   <div class="chart">   </div>  </div>

$ch = curl_init();  curl_setopt($ch, CURLOPT_URL, $url);  curl_setopt($ch, CURLOPT_POST, 1);  curl_setopt( $ch, CURLOPT_HEADER, 0 );  curl_setopt( $ch, CURLOPT_RETURNTRANSFER, 1 );  curl_setopt( $ch, CURLOPT_POSTFIELDS, $data );  $return = curl_exec( $ch );  curl_close( $ch );      $regex4="/<div class=\"tideTable\".*?>.*?<\/div>/ism";  if(preg_match_all($regex4, $return, $matches)){     print_r($matches);  }else{     echo '0';  }