URL url = new URL(urlstr.replace('[', 'w').replace(']', 'w'));
// url host must contain a dot
if (url.getHost().indexOf('.') < 0) {return null;}
URL url = new URL(urlstr.replace('[', 'w').replace(']', 'w'));
// url host must contain a dot
if (url.getHost().indexOf('.') < 0) {return null;}