code: def get_qcontent(value):
      
      ptext, value, _ = _get_ptext_to_endchars(value, '"')
      ptext = ValueTerminal(ptext, 'ptext')
      _validate_xtext(ptext)
      return ptext, value
docs: qcontent = qtext / quoted-pair
  
      We allow anything except the DQUOTE character, but if we find any ASCII
      other than the RFC defined printable ASCII an NonPrintableDefect is
      added to the token's defects list.  Any quoted pairs are converted to their
      unquoted values, so what is returned is a 'ptext' token.  In this case it
      is a ValueTerminal.