code: private int[] fetchDatabaseNameRangeIndexFromURLForH2FileMode(String url) {
      int fileLabelIndex = url.indexOf(FILE_MODE_FLAG);
      int parameterLabelIndex = url.indexOf(";", fileLabelIndex);
      if (parameterLabelIndex == -1) {
        parameterLabelIndex = url.length();
      }
  
      if (fileLabelIndex != -1) {
        return new int[]{fileLabelIndex + FILE_MODE_FLAG.length() + 1, parameterLabelIndex};
      } else {
        return null;
      }
    }
docs: Fetch range index that the database name from connection url if H2 database running with file
  mode.
  
  @return range index that the database name.