例えば、http://www.piyo.com/foo/bar/hoge.pngのようなurlからhoge.pngを取得したいとき
sample.js
var url = require('url');
var link = 'http://www.hoge.hoge/foo/bar/hoge.png';
var file = url.parse(link).pathname.split('/').pop();
// hoge.png
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