human
Solve the following python programming problem given the following code:
def get_wiki_syntax(self) : 
    wiki_page_name = ('(?:[%(upper)s](?:[%(lower)s])+/?){2,}(?:@[0-9]+)?(?:#%(xml)s)?(?=:(?:\\Z|\\s)|[^:\\w%(upper)s%(lower)s]|\\s|\\Z)' % { 
        'upper' : self.Lu, 
        'lower' : self.Ll, 
        'xml' : self.XML_NAME, 
}) 
    def wikipagename_link(formatter, match, fullmatch) : 
        return self._format_link (formatter, 'wiki', match, self.format_page_name (match), self.ignore_missing_pages, match) 
(yield (('!?(?<![\\w/])(?:\\.?\\.?/)*' + wiki_page_name), <MASK>)) 
    def wikipagename_with_label_link(formatter, match, fullmatch) : 
        page = fullmatch.group ('wiki_page') 
        label = fullmatch.group ('wiki_label') 
        return self._format_link (formatter, 'wiki', page, label.strip (), self.ignore_missing_pages, match) 
(yield (('!?\\[(?P<wiki_page>%s)\\s+(?P<wiki_label>%s|[^\\]]+)\\]' % (wiki_page_name, WikiParser.QUOTED_STRING)), wikipagename_with_label_link)) 
    def internal_free_link(fmt, m, fullmatch) : 
        page = fullmatch.group ('ifl_page') [1 : (- 1)] 
        label = fullmatch.group ('ifl_label') 
        if (label is None) : 
            label = self.make_label_from_target (page) 
return self._format_link (fmt, 'wiki', page, label.strip (), False) 
(yield (('!?\\[(?P<ifl_page>%s)(?:\\s+(?P<ifl_label>%s|[^\\]]+))?\\]' % (WikiParser.QUOTED_STRING, WikiParser.QUOTED_STRING)), internal_free_link)) 
    
    Given the code above, what is a proper replacement for <MASK>?
assistant
#Here is a proper replacement for <MASK>.
def wikipagename_link(