code: function (rawHtml) {
              var matchKeys = Object.keys(options.unescape);
              if (matchKeys.length === 0) {
                  return rawHtml;
              }
              var pattern = new RegExp('(' + matchKeys.join('|') + ')', 'g');
              return rawHtml.replace(pattern, function (match) {
                  return options.unescape[match];
              });
          }
docs: Replace characters according to 'unescape' option