code: function(match, step) {
  				var matches = 1;
  				while (iFormat + matches < format.length && format.charAt(iFormat + matches) === match) {
  					matches++;
  				}
  				iFormat += matches - 1;
  				return Math.floor(matches / (step || 1)) > 1;
  			}
docs: Check whether a format character is doubled