Check Url if valid in Javascript
The function checks for a pattern in the string, and if the pattern matches, then returns true. Else returns false. Observe the below pattern. The pattern in this function will check for a valid URL skeleton such as the URL protocol, domain name, ip address etc.
url validator javascript
function validURL(str) {
var pattern = new RegExp('^(https?:\\/\\/)?'+ // protocol
'((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|'+ // domain name
'((\\d{1,3}\\.){3}\\d{1,3}))'+ // OR ip (v4) address
'(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*'+ // port and path
'(\\?[;&a-z\\d%_.~+=-]*)?'+ // query string
'(\\#[-a-z\\d_]*)?$','i'); // fragment locator
return !!pattern.test(str);
}check if a JavaScript string is a URL
function isValidURL(string) {
var res = string.match(/(http(s)?:\/\/.)?(www\.)?[-a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)/g);
return (res !== null)
};
var testCase1 = "http://en.wikipedia.org/wiki/Procter_&_Gamble";
alert(isValidURL(testCase1));