code: function(string, $el) {
              var img = $el.find('img');
              var matchStart = $el.text().toLowerCase().indexOf("" + string.toLowerCase() + ""),
                  matchEnd = matchStart + string.length - 1,
                  beforeMatch = $el.text().slice(0, matchStart),
                  matchText = $el.text().slice(matchStart, matchEnd + 1),
                  afterMatch = $el.text().slice(matchEnd + 1);
              $el.html("<span>" + beforeMatch + "<span class='highlight'>" + matchText + "</span>" + afterMatch + "</span>");
              if (img.length) {
                $el.prepend(img);
              }
            }
docs: Highlight partial match.