docs: def _sheet_meta_from_regex(m, sheets, old_name, name, ct_paleo, ct_chron):
      """
      Build metadata for a sheet. Receive valid regex match object and use that to create metadata.
      :param obj m: Regex match object
      :param list sheets: Running list of sheet metadata
      :param str old_name: Original sheet name
      :param str name: Data set name
      :param int ct_paleo: Running count of paleoData tables
      :param int ct_chron: Running count of chronData tables
      :return sheets paleo_ct chron_ct: Updated sheets and counts
      """
      try:
          idx_model = None
          idx_table = None
          pc = m.group(1)
          # Get the model idx number from string if it exists
          if m.group(3):
              idx_model = int(m.group(4))
          # check if there's an index (for distribution tables)
          if m.group(6):
              idx_table = int(m.group(6))
          # find out table type
          if pc == "paleodata" or pc == "paleo":
              pc = "paleo"
              ct_paleo += 1
          elif pc == "chrondata" or pc == "chron":
              pc = "chron"
              ct_chron += 1
          # build filename and table name strings. build table name first, then make filename from the table_name
          new_name = "{}{}".format(pc, m.group(2))
          if idx_model:
              new_name = "{}model{}".format(new_name, idx_model)
          new_name = "{}{}".format(new_name, m.group(5))
          if idx_table:
              new_name = "{}{}".format(new_name, m.group(6))
          filename = "{}.csv".format(new_name)
      except Exception as e:
          logger_excel.debug("excel: sheet_meta_from_regex: error during setup, {}".format(e))
  
      # Standard naming. This matches the regex and the sheet name is how we want it.
      # paleo/chron - idx - table_type - idx
      # Not sure what to do with m.group(2) yet
      # ex: m.groups() = [ paleo, 1, model, 1, ensemble, 1 ]
      try:
          sheets.append({
              "old_name": old_name,
              "new_name": new_name,
              "filename": filename,
              "paleo_chron": pc,
              "idx_pc": int(m.group(2)),
              "idx_model": idx_model,
              "idx_table": idx_table,
              "table_type": m.group(5),
              "data": ""
          })
      except Exception as e:
          print("error: build sheets")
          logger_excel.debug("excel: build_sheet: unable to build sheet, {}".format(e))
  
      return sheets, ct_paleo, ct_chron