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

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.

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);

//演示輸出的結(jié)果，你可以根據(jù)你的需求，從$matches中拿到你想要的xxx部分。
var_dump($matches);

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