PHP的preg_match返回兩個字符串

Question

之間的串

我怎樣才能得到這個鏈接 「http://example.com/view.php?id=5841」 從代碼：

<h3 class="coursename"><a class="" href="http://example.com/view.php?id=521">D<span class="highlight">LAW</span> <span class="highlight">130</span>Management</a></h3><div class="moreinfo"></div></div><div class="content"><ul class="teachers"><li>Teacher: <a href="http://example.com/">John</a></li></ul><div class="coursecat">Category: <a class="" href="http://example.com/">First</a></div></div></div><div class="coursebox clearfix even" data-courseid="5841" data-type="1"><div class="info"><h3 class="coursename"><a class="" href="http://example.com/view.php?id=5841"><span class="highlight">LAW</span> <span class="highlight">130` 

我想：

preg_match('/href="(.*)"><span class="highlight">LAW/isU',$BBB,$AAA); 

，結果是：

http://example.com/view.php?id=521">D<span class="highlight">LAW</span> <span class="highlight">130</span>Management</a></h3><div class="moreinfo"></div></div><div class="content"><ul class="teachers"><li>Teacher: <a href="http://example.com/">John</a></li></ul><div class="coursecat">Category: <a class="" href="http://example.com/">First</a></div></div></div><div class="coursebox clearfix even" data-courseid="5841" data-type="1"><div class="info"><h3 class="coursename"><a class="" href="http://example.com/view.php?id=5841 

Answer 1

用此代替：

/href="(.[^<]*?)"><span class="highlight">LAW/isU 

這是一種告訴正則表達式找到與你想要的最短表達式相匹配的簡單方法。

Answer 2

使用XPath查詢：

libxml_use_internal_errors(true); 
$dom = new DOMDocument; 
$dom->loadHTML($yourHTML); 

$xp = new DOMXPath($dom); 
$link = $xp->query('//a[span[@class="highlight"]][starts-with(.,"LAW")][1]/@href')->item(0)->nodeValue; 

echo $link; 

查詢詳情：

// # axe: anywhere in the DOM tree 
a # axe: a "a" tag 
[span[@class="highlight"]] # predicate: the "a" tag has for direct child a "span" tag 
          # with a "class" attribute equal to "highlight" 
[starts-with(.,"LAW")]  # predicate: its text content begins with "LAW" 
[1]      # predicate: first occurrence (no need to search another one) 
/@href      # axe: its "href" attribute