How should I write a regular expression that matches within an area?

  has a $link= "url", open after the code as follows: ...            
   
   
   
 
    
  2016-06-06  Yang Shan 2016 14 road greening project tender announcement 
 
    
  2016-06-06  Pingqiao District Minggang Town intersection-waste treatment yard-Hegang village South Junction (k0+000-k4+300) Road reconstruction project construction tender Notice 
 
    
  2016-05-31  Yang Shan branch of Xinyang City Center Hospital Public Defense Project Supervision tender notice 
 
    
  2016-05-31  Xinyang Hospital ward Building construction project construction and supervision Project tender announcement 
 
   
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目标：获得......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$num=preg_match_all("/.*?(href=\".*?\").*/is",$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。

Reply content:

  has a $link= "url", open after the code as follows: ...            
   
   
   
 
    
  2016-06-06  Yang Shan 2016 14 road greening project tender announcement 
 
    
  2016-06-06  Pingqiao District Minggang Town intersection-waste treatment yard-Hegang village South Junction (k0+000-k4+300) Road reconstruction project construction tender Notice 
 
    
  2016-05-31  Yang Shan branch of Xinyang City Center Hospital Public Defense Project Supervision tender notice 
 
    
  2016-05-31  Xinyang Hospital ward Building construction project construction and supervision Project tender announcement 
 
   
!--Paging--> ...  

目标：获得......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$num=preg_match_all("/.*?(href=\".*?\").*/is",$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。

Look around should be able to meet your current needs.

preg_match_all('/(?<=\d{4}-\d{2}-\d{2}<\/span>)(?:.*?href=\")(.*?)(?:\".*?)(?=<\/li>)/is', $a, $matches);

array(2) {  [0]=>  array(4) {    [0]=>    string(152) "              羊山新区2016年14条道路绿化工程招标公告              "    [1]=>    string(218) "              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              "    [2]=>    string(161) "              信阳市中心医院羊山分院人防工程监理招标公告              "    [3]=>    string(173) "              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              "  }  [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"  }}

Cause: Only one match result of course the subexpression has only one result.

If you change to:

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

There are four match results for 4 matches.

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