code: def parseString( self, instring, parseAll=False ):
          
          ParserElement.resetCache()
          if not self.streamlined:
              self.streamline()
              #~ self.saveAsList = True
          for e in self.ignoreExprs:
              e.streamline()
          if not self.keepTabs:
              instring = instring.expandtabs()
          try:
              loc, tokens = self._parse( instring, 0 )
              if parseAll:
                  loc = self.preParse( instring, loc )
                  se = Empty() + StringEnd()
                  se._parse( instring, loc )
          except ParseBaseException as exc:
              if ParserElement.verbose_stacktrace:
                  raise
              else:
                  # catch and re-raise exception from here, clears out pyparsing internal stack trace
                  raise exc
          else:
              return tokens
docs: Execute the parse expression with the given string.
          This is the main interface to the client code, once the complete
          expression has been built.
  
          If you want the grammar to require that the entire input string be
          successfully parsed, then set ``parseAll`` to True (equivalent to ending
          the grammar with ``StringEnd()``).
  
          Note: ``parseString`` implicitly calls ``expandtabs()`` on the input string,
          in order to report proper column numbers in parse actions.
          If the input string contains tabs and
          the grammar uses parse actions that use the ``loc`` argument to index into the
          string being parsed, you can ensure you have a consistent view of the input
          string by:
  
          - calling ``parseWithTabs`` on your grammar before calling ``parseString``
            (see :class:`parseWithTabs`)
          - define your parse action using the full ``(s,loc,toks)`` signature, and
            reference the input string using the parse action's ``s`` argument
          - explictly expand the tabs in your input string before calling
            ``parseString``
  
          Example::
  
              Word('a').parseString('aaaaabaaa')  # -> ['aaaaa']
              Word('a').parseString('aaaaabaaa', parseAll=True)  # -> Exception: Expected end of text