如何使用正则表达式从HTML获取数据 [英] How to get data from HTML using regex

问题描述

我有以下HTML

 < table class =profile-stats> 
< tr> 
< td class =stat> 
< div class =statnum> 8< / div> 
< div class =statlabel>推文< / div> 
< / td> 
< td class =stat> 
< a href =/ THEDJMHA / following> 
< div class =statnum> 13< / div> 
< div class =statlabel>关注< / div> 
< / a> 
< / td> 
< td class =stat stat-last> 
< a href =/ THEDJMHA / followers> 
< div class =statnum> 22< / div> 
< div class =statlabel>关注者< / div> 
< / a> 
< / td> 
< / tr> 
< / table> 
  

我想从< td class =stat stat- <> code>< div class =statnum> = 22 。

我试过了下面的正则表达式，但没有找到任何匹配的结果。

  /< div \sclass =statnum> ^（。）\？< \ / div> / ig 
  

解决方案

以下是使用解析器完成此操作的一种方法。

 <？php 
 $ html ='< table class =profile-stats> 
< tr> 
< td class =stat> 
< div class =statnum> 8< / div> 
< div class =statlabel>推文< / div> 
< / td> 
< td class =stat> 
< a href =/ THEDJMHA / following> 
< div class =statnum> 13< / div> 
< div class =statlabel>关注< / div> 
< / a> 
< / td> 
< td class =stat stat-last> 
< a href =/ THEDJMHA / followers> 
< div class =statnum> 22< / div> 
< div class =statlabel>关注者< / div> 
< / a> 
< / td> 
< / tr> 
< / table>'; 
 $ doc = new DOMDocument（）; //创建一个dom对象
 $ doc-> loadHTML（$ html）; 
 $ tds = $ doc-> getElementsByTagName（'td'）; 
 foreach（$ tds as $ cell）{//遍历所有单元格
 if（strpos（$ cell-> getAttribute（'class'），'stat-last'））{
 $ divs = $ cell-> getElementsByTagName（'div'）; 
 foreach（$ divs as $ div）{//遍历单元格的所有div 
 if（$ div-> getAttribute（'class'）=='statnum'）{
 echo $ div-> nodeValue; 
 
 
 
 
 code 
 
 
 
输出：
 
 
 
 
 22 
 
 
 ...或使用xpath ... 
  $ doc = new DOMDocument（）; //创建一个dom对象
 $ doc-> loadHTML（$ html）; 
 $ xpath = new DOMXpath（$ doc）; 
 $ statnums = $ xpath-> query（// td [@ class ='stat stat-last'] / a / div [@ class ='statnum']）; 
 foreach（$ statnums as $ statnum）{
 echo $ statnum-> nodeValue; 
} 
  
输出： 
 
 
 
 
 22 
 
 
或者如果您真的想要将它正则表达... 
 <？php 
 $ html ='< table class =profile-stats> 
< tr> 
< td class =stat> 
< div class =statnum> 8< / div> 
< div class =statlabel>推文< / div> 
< / td> 
< td class =stat> 
< a href =/ THEDJMHA / following> 
< div class =statnum> 13< / div> 
< div class =statlabel>关注< / div> 
< / a> 
< / td> 
< td class =stat stat-last> 
< a href =/ THEDJMHA / followers> 
< div class =statnum> 22< / div> 
< div class =statlabel>关注者< / div> 
< / a> 
< / td> 
< / tr> 
< / table>'; 
 preg_match（'〜td class =。*？stat-last>。*？< div class =statnum>（。*？）<〜s'，$ html，$ num ）; 
 echo $ num [1]; 
  
输出： 
 
 
 
正则表达式演示： https://regex101.com/r/kM6kI2/1  
 
I have following HTML
<table class="profile-stats">
  <tr>
    <td class="stat">
      <div class="statnum">8</div>
      <div class="statlabel"> Tweets </div>
    </td>
    <td class="stat">
        <a href="/THEDJMHA/following">
          <div class="statnum">13</div>
          <div class="statlabel"> Following </div>
        </a>
    </td>
    <td class="stat stat-last">
        <a href="/THEDJMHA/followers">
          <div class="statnum">22</div>
          <div class="statlabel"> Followers </div>
        </a>
    </td>
  </tr>
</table>
I want to get value from <td class="stat stat-last"> => <div class="statnum"> = 22.

I have tried the follow regex but does not any found match.
/<div\sclass="statnum">^(.)\?<\/div>/ig

解决方案
Here's a way to accomplish this using a parser.
<?php
$html = '<table class="profile-stats">
  <tr>
    <td class="stat">
      <div class="statnum">8</div>
      <div class="statlabel"> Tweets </div>
    </td>
    <td class="stat">
        <a href="/THEDJMHA/following">
          <div class="statnum">13</div>
          <div class="statlabel"> Following </div>
        </a>
    </td>
    <td class="stat stat-last">
        <a href="/THEDJMHA/followers">
          <div class="statnum">22</div>
          <div class="statlabel"> Followers </div>
        </a>
    </td>
  </tr>
</table>';
$doc = new DOMDocument(); //make a dom object
$doc->loadHTML($html);
$tds = $doc->getElementsByTagName('td');
foreach ($tds as $cell) { //loop through all Cells
    if(strpos($cell->getAttribute('class'), 'stat-last')){
        $divs = $cell->getElementsByTagName('div');
        foreach($divs as $div) { // loop through all divs of the cell
            if($div->getAttribute('class') == 'statnum'){
                echo $div->nodeValue;
            }
        }
    }
}
Output:

  
22
...or using an xpath...
$doc = new DOMDocument(); //make a dom object
$doc->loadHTML($html);
$xpath = new DOMXpath($doc);
$statnums = $xpath->query("//td[@class='stat stat-last']/a/div[@class='statnum']");
foreach($statnums as $statnum) {
    echo $statnum->nodeValue;
}
Output:

  
22
or if you realllly wanted to regex it...
<?php
$html = '<table class="profile-stats">
  <tr>
    <td class="stat">
      <div class="statnum">8</div>
      <div class="statlabel"> Tweets </div>
    </td>
    <td class="stat">
        <a href="/THEDJMHA/following">
          <div class="statnum">13</div>
          <div class="statlabel"> Following </div>
        </a>
    </td>
    <td class="stat stat-last">
        <a href="/THEDJMHA/followers">
          <div class="statnum">22</div>
          <div class="statlabel"> Followers </div>
        </a>
    </td>
  </tr>
</table>';
preg_match('~td class=".*?stat-last">.*?<div class="statnum">(.*?)<~s', $html, $num);
echo $num[1];
Output:

  
22
Regex demo: https://regex101.com/r/kM6kI2/1

                        
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