CODE EXAMPLE FOR JAVASCRIPT

website link regex stackoverflow

var regex = new RegExp("^(https://www.){1}([0-9A-Za-z-.@:%_+~#=]+)+((.[a-zA-Z]{2,3})+)(/(.)*)?(?(.)*)?";);

if(regex.test("http://google.com")){
  alert("Successful match");
}else{
  alert("No match");
}