Valid URL Sample

var urls = ['http://www.starwars.com', 'https://www.starwars.com', 'www.starwars.com', 'foo']; var result = ''; for(var url of urls) { result += validUrl(url) + '\n'; } function validUrl(url) { if (url.indexOf('https://')==-1 && url.indexOf('http://')==-1) { url = 'http://' + url }; var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol '((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name and extension '((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address '(\\:\\d+)?'+ // port '(\\/[-a-z\\d%@_.~+&:]*)*'+ // path '(\\?[;&a-z\\d%@_.,~+&:=-]*)?'+ // query string '(\\#[-a-z\\d_]*)?#x27;,'i'); // fragment locator if(!pattern.test(url)) { console.log('Invalid LAUNCH button URL: ' + url); } else { return url; } } result;