• tirar LF
  \n => ""
• tirar CR
  \r => ""
• arrancar lixo inicial e final
  [^\&]+\&lt;\?(.*)</fieldset>.* => <\1</fieldset>

.<fieldset>[^<]*<legend>([^<]*)</legend>([^<]*)</fieldset> => _^\1^_\2_^/\1^_
<fieldset>[^<]*<legend>([^<]*)</legend>((^fieldset)*)</fieldset>
(^fieldset)

• .*<fieldset>[^<]*<legend>([^<]*)</legend>(.*)</fieldset>.* => <\1>\t\2</\1>
• .*<fieldset>(.*)</fieldset>.* => <fieldset>\1</fieldset>