JSFiddle - React, Tailwind, and code Playground

HTML

<textarea>
    stackoverflow
</textarea>

CSS

textarea {
    height:200px;
    width:400px; }

JavaScript

$(document).ready(function(){
   var txt = $('textarea').text();
   var link = 'http://www.stackoverflow.com/';
    
       if(txt.indexOf(link) > -1) {
           alert('Has link');
        }
    
});