Rather more efficient:
Sub Demo() Application.ScreenUpdating = False With ActiveDocument.Range.Find .ClearFormatting .Replacement.ClearFormatting .Format = False .Forward = True .Wrap = wdFindStop .MatchWildcards = True .Text = "[" & ChrW(&H1000) & "-" & ChrW(&H109F) & "]" .Replacement.Text = "" .Execute Replace:=wdReplaceAll End With Application.ScreenUpdating = True End Sub