Question

我是正则表达式的新手，我在Wordpress中遇到了这段代码，但我无法理解发生了什么，尽管有评论。请帮我搞清楚。

    // catch base url
    preg_match('/href="(.+?)"/i', $content, $matches);
    $baseref = (is_array($matches) && !empty($matches)) ? $matches[1] : '';

    // get the first image from content
    preg_match('/<img.+?src="(.+?)"[^}]+>/i', $content, $matches);

    $img_url = (is_array($matches) && !empty($matches)) ? $matches[1] : '';

这里是$ content包含的内容。

    <![CDATA[<p>Buganda Road Chief Magistrate James Mawanda Eremye has released Makerere University administrator Edward Kisuze. The suspended administrator is accused of  sexually harassing a student. Court told Kisuzze to pay cash bail of Shs2m and each of his three sureties Shs10m.</p>

    <p><a href="http://matookerepublic.com/wp-content/uploads/2018/04/kisuze.png"><img class="alignnone wp-image-32386" src="http://matookerepublic.com/wp-content/uploads/2018/04/kisuze-300x175.png" alt="" width="680" height="396" srcset="http://matookerepublic.com/wp-content/uploads/2018/04/kisuze-300x175.png 300w, http://matookerepublic.com/wp-content/uploads/2018/04/kisuze-696x405.png 696w, http://matookerepublic.com/wp-content/uploads/2018/04/kisuze.png 720w" sizes="(max-width: 680px) 100vw, 680px" /></a></p>

    <p>However, before releasing him the magistrate ordered the prosecutor to disclose to the defence  the evidence to enable commencement of hearing of this case come <span data-term="goog_350196878">May 28 2018</span>.</p>

<p>On April 14, police arrested Kisuze after a viral picture of him kissing the student&#8217;s private parts in office was released online. On May 4<sup>,</sup> he appeared before court and was remanded to Luzira prison after pleading not guilty to charges.</p>
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Answer 1

第一个/href="(.+?)"/i用于从href标记中提取a属性。

查看实例：https://regex101.com/r/84dhEk/2（绿色部分是匹配的）

第二个/<img.+?src="(.+?)"[^}]+>/i用于从src标记中提取img属性。

查看此示例：https://regex101.com/r/SOPN5I/2

解释正则表达式

1 个答案: