code: def find_link_rex(self, rex, make_absolute=True):
          
  
          if make_absolute:
              self.tree.make_links_absolute(self.doc.url)
  
          for elem, _, link, _ in self.tree.iterlinks():
              if elem.tag == 'a':
                  match = rex.search(link)
                  if match:
                      # That does not work for string object
                      # link.match = match
                      return link
          return None
docs: Find link matched the given regular expression in response body.
  
          Returns found url or None.