code: function indexOf(match) {
          var i = matches.length;
          while (i--) {
            if (matches[i] === match) {
              return i;
            }
          }
  
          return -1;
        }
docs: Returns the index of a specific match object or -1 if it isn't found.
  
  @param  {Match} match Text match object.
  @return {Number} Index of match or -1 if it isn't found.