Check if a JavaScript string is a URL

Question

Can anyone tell me how can I check if a string is a URL in JavaScript?

Answer 1

 You can use Regexp from Devshed like below:

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);

}

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