JSFiddle - React, Tailwind, and code Playground
by Vinay Pratap Singh Bhadauria
HTML
<input type="button" value="get String" id="convert">
<div id="testDiv"></div>
JavaScript
$("#convert").click(function(){
var message = "[url=http://stackoverflow.com/questions/18952258/javascript-convert-url-to-html-link]this is a link [/url]"
message = message.match("/(\b(https?):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/");
alert(message);
});