Given a URL as a string, how to extract just the domain and extension?

Question

Given a string with URLs in the following formats:

https://www.cnn.com/
http://www.cnn.com/
http://www.cnn.com/2012/02/16/world/american-nicaragua-prison/index.html
http://edition.cnn.com/?hpt=ed_Intl

W JS/jQuery, how can I extract from the string just cnn.com for all of them? Top level domain plus extension?

Thanks

Why bother with regex. It's a Swiss army knife when all you need is a spoon. — tkone, Feb 20 '12 at 00:26
@AnApprentice if you want subdomains, just use `location.host`. No need for regex at alla. — tkone, Feb 20 '12 at 00:31

score 3 · Answer 1 · edited May 23 '17 at 12:07

3

var loc = document.createElement('a');

loc.href = 'http://www.cnn.com/2012/02/16/world/index.html';

window.alert(loc.hostname); // alerts "cnn.com"

Credits for the previous method:

Creating a new Location object in javascript

edited May 23 '17 at 12:07

Community

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answered Feb 20 '12 at 00:33

Alex

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hence: `loc.hostname.split('.').slice(-2).join('.')` but you're still gonna get screwed on the whole `.co.uk` type of domain... – tkone Feb 20 '12 at 13:11

score 1 · Answer 2 · answered Feb 25 '16 at 22:25

1

function domain(input){
    var matches,
        output = "",
        urls = /\w+:\/\/([\w|\.]+)/;

    matches = urls.exec(input);

    if(matches !== null){
        output = matches[1];
    }

    return output;
}

answered Feb 25 '16 at 22:25

chrishawn

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tkone · Answer 3 · 2012-02-20T00:30:24.580

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var domain = location.host.split('.').slice(-2);

If you want it reassembled:

var domain = location.host.split('.').slice(-2).join('.');

But this won't work with co.uk or something. There's no hard nor fast rule for this, not even regex will determine that.

edited Feb 20 '12 at 00:30

answered Feb 20 '12 at 00:24

tkone

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... where `location.host` is the subject string – satoshi Feb 20 '12 at 00:26
@satoshi `location.host` is the string property of the location object. It refers to the data between the '//' and the first '/' in your URL. It's in browsers back to IE6 and I believe even Netscape 4. – tkone Feb 20 '12 at 00:29
This doesn't work at all. `"http://www.cnn.com/2012/02/16/world/american-nicaragua-prison/index.html".split('.').slice(-2).join('.')` -> `"com/2012/02/16/world/american-nicaragua-prison/index.html"` – Dagg Nabbit Feb 20 '12 at 00:31
@ggg location is a browser object. Location.host is the server URL. Try that in the chrome debugger or firebug, etc – tkone Feb 20 '12 at 00:32
What I'm saying is that the question author didn't ask to have this regex applied to the current page... – satoshi Feb 20 '12 at 00:46
ah, you're right, my mistake! I somehow read that as `location.href`. By the way, this doesn't work with TLDs with dots in them (`co.uk` for example). @satoshi it could be used in conjunction with a trick like Xander proposes below (if it worked with dotted TLDs). – Dagg Nabbit Feb 20 '12 at 00:48

score 0 · Answer 4 · answered Feb 20 '12 at 00:26

0

Given that there are top-level domains with dots in them, for example "co.uk", there's no way to do this programatically unless you include a list of all of the TLDs with dots in them.

answered Feb 20 '12 at 00:26

Dagg Nabbit

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score -1 · Answer 5 · answered May 01 '12 at 05:16

-1

// something.domain.com -> domain.com
function getDomain() {
  return window.location.hostname.replace(/([a-z]+.)/,"");
}

answered May 01 '12 at 05:16

Gubatron

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About your regular expression. A. you don't need to capture a group here. B. you're trying to match a . with a . that matches any other character too (except \n) So this should be: window.location.hostname.replace(/[a-z]+\./,"") – Christiaan Westerbeek May 23 '14 at 12:25

Given a URL as a string, how to extract just the domain and extension?

5 Answers5