if (sys.gvarfind('re_is_set') = -1)
  gvar (re_is_set)
  fvar(cur)
  cur = block.select(BLK_OBJ)
  println('Dim re')
  println('Set re = New RegExp')
  println('')
  block.select(BLK_NOTH)
  println('Set re = Nothing')
  block.select(cur)
end