code: def parse_region(region):
      
      m = R_REGEX_STRAND.search(region)
      if not m:
          m = R_REGEX.search(region)
      if m:
          groups = m.groups()
          return groups
      else:
          return None
docs: Parse region of type chr1:10-20 or chr1:10-20:+
  
      Parameters:
      -----------
  
      region : str
          Region of type chr1:10-20 or chr1:10-20:+.
  
      Returns
      -------
      groups : tuple
          Tuple of groups from regex e.g. (chr1, 10, 20) or (chr1, 10, 20, +).