JSFiddle - React, Tailwind, and code Playground

by Anirudh Tewathia

HTML

<div>
    <div id="Q01">
        <p>Some text</p>
    </div>
    <div id="Q02">
        <p>Some text</p>
    </div>
    <div id="Q03">
        <p>Some text</p>
    </div>
    <div id="R04">
        <p>Some text</p>
    </div>
    <label for="number">Number of DIVs:</label>
    <input type="number" name="result" id="number">
</div>

CSS

.red {
    color:red;
}

JavaScript

var Q_Num = $('*').filter(function () {
    return this.id.match(/Q\d+/);
});
Q_Num.addClass('red');
alert(Q_Num.length);