code: def complete_vrf(arg):
      
  
      search_string = ''
      if arg is not None:
          search_string = '^%s' % arg
  
      res = VRF.search({
          'operator': 'regex_match',
          'val1': 'rt',
          'val2':  search_string
          }, { 'max_result': 100000 } )
  
      ret = []
  
      for v in res['result']:
          ret.append(v.rt)
      if re.match(search_string, 'none'):
          ret.append('none')
  
      return ret
docs: Returns list of matching VRFs