docs: def _parse_dbpath(dbpath):
          """Converts the dbpath to a regexp pattern.
  
          Transforms dbpath from a string or an array of strings to a
          regexp pattern which will be used to match database names.
  
          Args:
              dbpath: a string or an array containing the databases to be matched
                  from a cluster.
  
          Returns:
              A regexp pattern that will match any of the desired databases on
              on a cluster.
          """
          if isinstance(dbpath, list):
              # Support dbpath param as an array.
              dbpath = '|'.join(dbpath)
  
          # Append $ (end of string) so that twit will not match twitter!
          if not dbpath.endswith('$'):
              dbpath = '(%s)$' % dbpath
  
          return dbpath