docs: function interpolate(string, object) {
      forOwn(object, function(value, key) {
        // escape regexp special characters in `key`
        string = string.replace(RegExp('#\\{' + key.replace(/([.*+?^=!:${}()|[\]\/\\])/g, '\\$1') + '\\}', 'g'), value);
      });
      return string;
    }