// Thanks to Andrew Clover:
  // http://stackoverflow.com/questions/3561493
  // /is-there-a-regexp-escape-function-in-javascript
  
  'use strict';
  
  var re = /[\-\/\\\^$*+?.()|\[\]{}]/g;
  
  module.exports = function (str) { return String(str).replace(re, '\\$&'); };