parse query string in javascript

queryString.js

function queryString(name) {
  var results = new RegExp(
    '[\\?&]' +
    name.replace(/[\[]/, '\\\[').replace(/[\]]/, '\\\]') +
    '=([^&#]*)'
  ).exec(window.location.search);
  if (null === results) return '';
  return decodeURIComponent(results[1].replace(/\+/g, ' '));
}