Javascript to extract *.com

I am looking for a javascript function/regex to extract *.com from a URI... (to be done on client side)

It should work for the following cases:

siphone.com = siphone.com
qwr.siphone.com = siphone.com
www.qwr.siphone.com = siphone.com
qw.rock.siphone.com = siphone.c开发者_如何学JAVAom
<http://www.qwr.siphone.com> = siphone.com

Much appreciated!

Edit: Sorry, I missed a case:

http://www.qwr.siphone.com/default.htm = siphone.com

I guess this regex should work for a few cases:

/[\w]+\.(com|ca|org|net)/

I'm not good with JavaScript, but there should be a library for splitting URIs out there, right?

According to that link, here's a "strict" regex:

/^(?:([^:\/?#]+):)?(?:\/\/((?:(([^:@]*)(?::([^:@]*))?)?@)?([^:\/?#]*)(?::(\d*))?))?((((?:[^?#\/]*\/)*)([^?#]*))(?:\?([^#]*))?(?:#(.*))?)/

As you can see, you're better off just using the "library". :)

This should do it. I added a few cases for some nonmatches.

var cases = [
  "siphone.com",
  "qwr.siphone.com",
  "www.qwr.siphone.com",
  "qw.rock.siphone.com",
  "<http://www.qwr.siphone.com>",
  "hamstar.corm",
  "cheese.net",
  "bro.at.me.come",
  "http://www.qwr.siphone.com/default.htm"];

var grabCom = function(str) {
  var result = str.match("(\\w+\\.com)\\W?|$");
  if(result !== null)
    return result[1];
  return null;
};

for(var i = 0; i < cases.length; i++) {
  console.log(grabCom(cases[i]));
}

var myStrings = [
  'siphone.com',
  'qwr.siphone.com', 
  'www.qwr.siphone.com', 
  'qw.rock.siphone.com', 
  '<http://www.qwr.siphone.com>'
  ];

for (var i = 0; i < myStrings.length; i++) {
    document.write( myStrings[i] + '=' +  myStrings[i].match(/[\w]+\.(com)/gi) + '<br><br>');
}

I've placed given demo strings to the myStrings array.
i - is index to iterate through this array. The following line does the matching trick:

myStrings[i].match(/[\w]+\.(com)/gi)

and returns the value of siphone.com. If you'd like to match .net and etc. - add (com|net|other) instead of just (com).

Also you may find the following link useful: Regular expressions Cheat Sheet

update: missed case works too %)

You could split the string then search for the .com string like so

var url = 'music.google.com'
var parts = url.split('.');
for(part in parts) {
    if(part == 'com') {
        return true;
    }
{

uri = "foo.bar.baz.com"
uri.split(".").slice(-2).join(".") // returns baz.com

This assumes that you want just the hostname and tld. It also assumes that there is no path information either.

Updated now that you also need to handle uris with paths you could do:

uri.split(".").slice(-2).join(".").split("/")[0]

Use regexp to do that. This way modifications to the detections are quite easy.

var url = 'www.siphone.com';
var domain = url.match(/[^.]\.com/i)[0];

If you use url.match(/(([^.]+)\.com)[^a-z]/i)[1] instead. You can assure that the ".com" is not followed by any other characters.