JSFiddle - React, Tailwind, and code Playground

JavaScript

var reg = /[-a-zA-Z0-9@:%_\+.~#?&//=]{2,256}\.[a-z]{2,4}\b(\/[-a-zA-Z0-9@:%_\+.~#?&//=]*)?/gi;
    
    var url = "Hey, have a look at this picture here http://example.com/fantastic.jpg, isn't it nice?"

var urlpart = url.match(reg).toString();
console.log(urlpart);