how can i validate a url in javascript using regular expression

Question

i want to validate a textbox who have some url value like blogs address or site adress how can i validate this textbox in js

Answer 1

Do a basic RegExp test for formatting. Then ping the URL using an XMLHttpRequest to make sure it exists. An example using jQuery...

var url = $("#txtUserWebSite").val();
var reg = /^(([\w]+:)?\/\/)?(([\d\w]|%[a-fA-f\d]{2,2})+(:([\d\w]|%[a-fA-f\d]{2,2})+)?@)?([\d\w][-\d\w]{0,253}[\d\w]\.)+[\w]{2,4}(:[\d]+)?(\/([,-+_~.\d\w]|%[a-fA-f\d]{2,2})*)*(\?(&?([,-+_~.\d\w]|%[a-fA-f\d]{2,2})=?)*)?(#([,-+_~.\d\w]|%[a-fA-f\d]{2,2})*)?$/; 

if(!reg.test(url)) {
  alert("Invalid URL!");
  return false;
}

$.get(url, function(dat, stat) {
  if(stat == "success")
    alert("Valid URL!");
  else
    alert("Invalid URL!");
})