I have a question about php regular expressions. . .

Question

There are some special needs. An expression is needed to extract N field data in html
For example

<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>

We need to extract the title and pic data from HTML. How to write the regular expression?
The <p class="xas"></p><pclass="asd"></p> in the middle is different content, but this content is useless and there is no need to crawl it
I'm just getting started. Please give me some advice. Thank you

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.