A function to parse the domain from the host. #tld #domain #parser #parse #javascript #js #nodejs

domain-parser-test.js

exports.domain = function(str) {
  var a = str.match(/^(\w+:\/\/)?([\w-.]+)/)[2].split('.');
  return (a[a.length-1].length === 2 && a[a.length - 2].length === 2 ? a.splice(-3) : a.splice(-2)).join('.');
};

var tld = require('./domain-parser');
var assert = require('assert');

var test1 = 'http://google.com/?foo=bar';
var test2 = 'https://www.google.info/?foo';
var test3 = 'http://abc.def.google.co.uk/?foo';
var test4 = 'http://abc.def.google.com.uk/?foo';
var test5 = 'http://abc.def.google.bar.uk/?foo';
var test6 = 'http://google.ly/?foo';
var test7 = 'http://bit.ly';
var test8 = 'http://mobile.bit.ly';
var test9 = 'http://m.bit.ly';

assert.equal(tld.domain(test1), 'google.com');
assert.equal(tld.domain(test2), 'google.info');
assert.equal(tld.domain(test3), 'google.co.uk');
assert.equal(tld.domain(test4), 'google.com.uk');
assert.equal(tld.domain(test5), 'bar.uk');
assert.equal(tld.domain(test6), 'google.ly');
assert.equal(tld.domain(test7), 'bit.ly');
assert.equal(tld.domain(test8), 'bit.ly');