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zPattern.opengroupc C s | j � | j | <d S)N)�getwidthr )r r$ �pr r r �
closegroupZ s zPattern.closegroupc C s | | j k o | j | d k S)N)r r )r r$ r r r �
checkgroup\ s zPattern.checkgroupc C sO | j d k rK | j | � s- | j d � � | | j k rK | j d � � d S)Nz cannot refer to an open groupz?cannot refer to group defined in the same lookbehind subpattern)r r* r! )r r$ �sourcer r r �checklookbehindgroup_ s
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