What is a good regular expression to match a URL? [duplicate]

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  3. What is a good regular expression to match a URL? [duplicate]

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Currently I have an input box which will detect the URL and parse the data.

So right now, I am using:

var urlR = /^(?:([A-Za-z]+):)?(\/{0,3})([0-9.\-A-Za-z]+)
var url= content.match(urlR);

The problem is, when I enter a URL like www.google.com, its not working. when I entered http://www.google.com, it is working.

I am not very fluent in regular expressions. Can anyone help me?

First answer

Second answer

These are the droids you’re looking for. This is taken from validator.js which is the library you should really use to do this. But if you want to roll your own, who am I to stop you? If you want pure regex then you can just take out the length check. I think it’s a good idea to test the length of the URL though if you really want to determine compliance with the spec.

 function isURL(str) {
     var urlRegex = '^(?!mailto:)(?:(?:http|https|ftp)://)(?:\S+(?::\S*)?@)?(?:(?:(?:[1-9]\d?|1\d\d|2[01]\d|22[0-3])(?:\.(?:1?\d{1,2}|2[0-4]\d|25[0-5])){2}(?:\.(?:[0-9]\d?|1\d\d|2[0-4]\d|25[0-4]))|(?:(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)(?:\.(?:[a-z\u00a1-\uffff0-9]+-?)*[a-z\u00a1-\uffff0-9]+)*(?:\.(?:[a-z\u00a1-\uffff]{2,})))|localhost)(?::\d{2,5})?(?:(/|\?|#)[^\s]*)?
     var url = new RegExp(urlRegex, 'i');
     return str.length < 2083 && url.test(str);

Third answer

Another possible solution, above solution failed for me in parsing query string params.

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

  alert("Successful match");
  alert("No match");

In this solution please feel free to modify [-0-9A-Za-z\.@:%_\+~#=, to match the domain/sub domain name. In this solution query string parameters are also taken care.

If you are not using RegEx, then from the expression replace \\ by \.

Hope this helps.

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