请教个关于php正则表达式的问题。。。

Question

有点特殊需求，需要一条表达式取出html中N个字段数据
比如

<p class="test">
    <p class="title">xxx</p>
    <p class="xas"></p><pclass="asd"></p>
    <p class="pic">xxx</p>
</p>
<p class="test">
    <p class="title">xxx</p>
    <p class="xas"></p><pclass="asd"></p>
    <p class="pic">xxx</p>
</p>

需要在html中取出title以及pic的数据 正则该怎么写呢？
中间的 <p class="xas"></p><pclass="asd"></p> 为不同的内容 但是这些内容没什么用 没必要抓取
刚入门 请教一下 谢谢

Answer 1

You don’t have to use regular expressions, there is something called phpquery

Answer 2

let str = `
    <p class="test">
        <p class="title">xxx</p>
        <p class="xas"></p><pclass="asd"></p>
        <p class="pic">xxx</p>
    </p>
    <p class="test">
        <p class="title">xxx</p>
        <p class="xas"></p><pclass="asd"></p>
        <p class="pic">xxx</p>
    </p>
`

let results = str.match(/(title|pic)">.*?</g).map(e=>e.replace('">', ':')).map(e=>e.replace('<', ''))

The result is:

// results:
[ 'title:xxx', 'pic:xxx', 'title:xxx', 'pic:xxx' ]

Supplement:
I didn’t see clearly that the question mentioned PHP. I don’t know much about PHP. It’s written in js. You can just take the regular part.

Answer 3

Just upload the code

$re = '/(title|pic).*?>([^<]+)/';
$str = '<p class="test">
    <p class="title">xxx</p>
    <p class="xas"></p><pclass="asd"></p>
    <p class="pic">xxx</p>
</p>
<p class="test">
    <p class="title">xxx</p>
    <p class="xas"></p><pclass="asd"></p>
    <p class="pic">xxx</p>
</p>';

preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);

//演示输出的结果，你可以根据你的需求，从$matches中拿到你想要的xxx部分。
var_dump($matches);

Answer 4

This kind of performance is very poor -.-. It is still reliable to use js to obtain it at the front desk.