def split_str2indexes(string: str, max_check: int, length_limit=5):
  if not isinstance(string, str):
    raise ValueError('Invalid scheme for {:}'.format(string))
  srangestr = "".join(string.split())
  indexes = set()
  for srange in srangestr.split(','):
    srange = srange.split('-')
    if len(srange) != 2:
      raise ValueError('invalid srange : {:}'.format(srange))
    if length_limit is not None:
      assert len(srange[0]) == len(srange[1]) == length_limit, 'invalid srange : {:}'.format(srange)
    srange = (int(srange[0]), int(srange[1]))
    if not (0 <= srange[0] <= srange[1] < max_check):
      raise ValueError('{:} vs {:} vs {:}'.format(srange[0], srange[1], max_check))
    for i in range(srange[0], srange[1]+1):
      indexes.add(i)
  return indexes