get the tld (top-level-domain) from a url

for component:

$ component install ramitos/tld.js

for node.js:

$ npm install tld.js

with string url:

var tld = require('tld.js')
tld('https://www.example.co.uk') //=> co.uk

with parsed url:

var tld = require('tld.js'),
    url = require('url')
tld(url.parse('https://www.example.co.uk')) //=> co.uk

The node.js url parser is different from the browser url parser. So, the browser has 2 cases where the parsing is not correct:

• scheme://user:pass@www.example.org:123/some/directory/file.html?query=string#fragment should return org and returns nothing
• mailto:hello@example.org?subject=hello should return org and returns nothing

This two cases are covered in the tests and fail in the browser tests

$ npm test

• inspired by URI.js where the second-level-domain regular expression comes from

MIT