JSFiddle - React, Tailwind, and code Playground

HTML

<input class="top-display" value="5+5*11-15+(1.5)+(1/4)" id="display"> </input>
<button class="btn" > submit </button>

JavaScript

$('.btn').click(function(){
    // strip anything other than digits, (), -+/* and .
    var selected = $('#display').val().replace(/[^-()\d/*+.]/g, '');
    alert(eval(selected ));
});