code: function(matches)
          {
              // Optimized by Jose Prado (http://joseprado.com)
              for (var i = 0; i < matches.length; i++)
              {
                  if (matches[i] === null)
                      continue;
  
                  var itemI = matches[i],
                      itemIEndPos = itemI.index + itemI.length
                      ;
  
                  for (var j = i + 1; j < matches.length && matches[i] !== null; j++)
                  {
                      var itemJ = matches[j];
  
                      if (itemJ === null)
                          continue;
                      else if (itemJ.index > itemIEndPos)
                          break;
                      else if (itemJ.index == itemI.index && itemJ.length > itemI.length)
                          matches[i] = null;
                      else if (itemJ.index >= itemI.index && itemJ.index < itemIEndPos)
                          matches[j] = null;
                  }
              }
  
              return matches;
          }
docs: Checks to see if any of the matches are inside of other matches.
  This process would get rid of highligted strings inside comments,
  keywords inside strings and so on.