[Pharo-project] Regex with $? not working?

Hi guys. I am trying some regex expressions that involve '?' and they do not work. Try for example: '/<(\w+?)>([^<]+)/m' asRegex or '<([^/>]+)>([^<]*?)<\1>' asRegex and they all throw an error with the ? saying: 'RegexSyntaxError: nullable closure' Am I doing something wrong? Thanks, -- Mariano http://marianopeck.wordpress.com