JSFiddle - React, Tailwind, and code Playground

HTML

<div id="main">
 <div class="a"></div>
 <div class="b"><p>not me</p></div>
 <div class="b"></div>
 <div class="b"></div>
 <div class="c"></div>
</div>

CSS

#main div { width: 100px; height: 20px; margin: 5px; background: cyan; }
#main .selected { background: yellow; }

JavaScript

$('div.b').filter(function () {
    return $(this).find('p:contains(not me)').length == 0;
}).addClass('selected');