code: function parseRepeat (val) {
      var repeatInterval = 1;
      var atoms = val.split('/');
  
      if (atoms.length > 1) {
        return parseRange(atoms[0], atoms[atoms.length - 1]);
      }
  
      return parseRange(val, repeatInterval);
    }
docs: Parse repetition interval
  
  @param {String} val
  @return {Array}