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How should I write the regular expression for matching within a region?

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2016-07-06 13:54:121310browse

<code>有一个$link="url"，打开后代码如下：
<body>
    ......
     <div class="news_list">
            <ul>
             <li>
              <span>2016-06-06</span>
              <a href="/news!show.action?id=f435345c44e04ec3a5e6ccedca29e061">羊山新区2016年14条道路绿化工程招标公告</a>
              </li>
            <li>
              <span>2016-06-06</span>
              <a href="/news!show.action?id=ad4b065149d94704b3d295287f863b5a">平桥区明港镇井庄路口-垃圾处理场-何岗村南路口（K0+000-K4+300）公路改建工程施工招标公告</a>
              </li>
           <li>
              <span>2016-05-31</span>
              <a href="/news!show.action?id=c3b688ae2ec54fb0880a0f60f7a4f5f0">信阳市中心医院羊山分院人防工程监理招标公告</a>
              </li>
            <li>
              <span>2016-05-31</span>
              <a href="/news!show.action?id=2a7060f3519b40b3aa766dd53f2b00ad">信阳市儿童医院病房楼建设项目施工及监理项目招标公告</a>
              </li>
            </ul>
        </div>
        <!--分页-->
        <div class="page_num">
        ......
</body>
</code>
<code>目标：获得<div class="news_list">......<div class="page_num">中href标签里的内容"/news!show.action?id=2a7060f3519b40b3aa766dd53f2b00ad"

我写的代码如下：
//获取链接中的内容
$htmlContent=file_get_contents("$link");
//获取链接
$num=preg_match_all("/<div.*?class=\"news_list\">.*?(href=\".*?\").*<div.*class=\"page_num\">/is",$htmlContent,$array);
//打印数组
var_dump($array[1]);

目前卡顿的地方：在  //获取链接  处，子表达式只能获取一个结果，而且不是想要的href标签中的内容。</code>

Reply content: 

<code>有一个$link="url"，打开后代码如下：
<body>
    ......
     <div class="news_list">
            <ul>
             <li>
              <span>2016-06-06</span>
              <a href="/news!show.action?id=f435345c44e04ec3a5e6ccedca29e061">羊山新区2016年14条道路绿化工程招标公告</a>
              </li>
            <li>
              <span>2016-06-06</span>
              <a href="/news!show.action?id=ad4b065149d94704b3d295287f863b5a">平桥区明港镇井庄路口-垃圾处理场-何岗村南路口（K0+000-K4+300）公路改建工程施工招标公告</a>
              </li>
           <li>
              <span>2016-05-31</span>
              <a href="/news!show.action?id=c3b688ae2ec54fb0880a0f60f7a4f5f0">信阳市中心医院羊山分院人防工程监理招标公告</a>
              </li>
            <li>
              <span>2016-05-31</span>
              <a href="/news!show.action?id=2a7060f3519b40b3aa766dd53f2b00ad">信阳市儿童医院病房楼建设项目施工及监理项目招标公告</a>
              </li>
            </ul>
        </div>
        <!--分页-->
        <div class="page_num">
        ......
</body>
</code>
<code>目标：获得<div class="news_list">......<div class="page_num">中href标签里的内容"/news!show.action?id=2a7060f3519b40b3aa766dd53f2b00ad"

我写的代码如下：
//获取链接中的内容
$htmlContent=file_get_contents("$link");
//获取链接
$num=preg_match_all("/<div.*?class=\"news_list\">.*?(href=\".*?\").*<div.*class=\"page_num\">/is",$htmlContent,$array);
//打印数组
var_dump($array[1]);

目前卡顿的地方：在  //获取链接  处，子表达式只能获取一个结果，而且不是想要的href标签中的内容。</code>

Looking around should be able to meet your current needs

<code class="php">preg_match_all('/(?<=<span>\d{4}-\d{2}-\d{2}<\/span>)(?:.*?href=\")(.*?)(?:\".*?)(?=<\/li>)/is', $a, $matches);</code>
<code>array(2) {
  [0]=>
  array(4) {
    [0]=>
    string(152) "
              <a href="/news!show.action?id=f435345c44e04ec3a5e6ccedca29e061">羊山新区2016年14条道路绿化工程招标公告</a>
              "
    [1]=>
    string(218) "
              <a href="/news!show.action?id=ad4b065149d94704b3d295287f863b5a">平桥区明港镇井庄路口-垃圾处理场-何岗村南路口（K0+000-K4+300）公路改建工程施工招标公告</a>
              "
    [2]=>
    string(161) "
              <a href="/news!show.action?id=c3b688ae2ec54fb0880a0f60f7a4f5f0">信阳市中心医院羊山分院人防工程监理招标公告</a>
              "
    [3]=>
    string(173) "
              <a href="/news!show.action?id=2a7060f3519b40b3aa766dd53f2b00ad">信阳市儿童医院病房楼建设项目施工及监理项目招标公告</a>
              "
  }
  [1]=>
  array(4) {
    [0]=>
    string(53) "/news!show.action?id=f435345c44e04ec3a5e6ccedca29e061"
    [1]=>
    string(53) "/news!show.action?id=ad4b065149d94704b3d295287f863b5a"
    [2]=>
    string(53) "/news!show.action?id=c3b688ae2ec54fb0880a0f60f7a4f5f0"
    [3]=>
    string(53) "/news!show.action?id=2a7060f3519b40b3aa766dd53f2b00ad"
  }
}</code>

Reason: There is only one result of match, and of course the sub-expression also has only one result.

If changed to:

<code>$num = preg_match_all("/.*?(href=\".*?\").*?/is", $htmlContent, $array);</code>

There are four match results, so there are 4 matches..

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