JSFiddle - React, Tailwind, and code Playground

HTML

<ul id="test">
    <li>Lorem ipsum dolor sit amet, consectetuer adipiscing elit.</li>
    <li>Aliquam lorem tincidunt mauris eu Lorem risus.</li>
    <li>Vestibulum auctor dapibus neque.</li>
</ul>

CSS

.look-at-me {
    background: #f00;
}
match {
    background: #ff0;
}

JavaScript

$('li', '#test').each(function highlightElement(i, e) {
    e = $(e);
    e.html(e.html().replace(/rem/gi, function handleMatch(match) {
        if (!e.hasClass('look-at-me')) e.addClass('look-at-me');
        return '<match>' + match + '</match>';
    }));
});