code: def set_regex(self, regex=None, reset=False):
          
          if reset:
              text = ''
          else:
              text = self.finder.text().replace(' ', '').lower()
  
          self.proxy_model.set_filter(text)
          self.source_model.update_search_letters(text)
          self.sortByColumn(SEARCH_SCORE, Qt.AscendingOrder)
  
          if self.last_regex != regex:
              self.selectRow(0)
          self.last_regex = regex
docs: Update the regex text for the shortcut finder.