Sub Demo()
Application.ScreenUpdating = False
Options.DefaultHighlightColorIndex = wdYellow
With ActiveDocument.Range
  With .Find
    .ClearFormatting
    .Replacement.ClearFormatting
    .Text = "[0-9].[0-9a-z\(\)]{1,}"
    .Replacement.Highlight = True
    .Replacement.Text = "^&"
    .Wrap = wdFindContinue
    .MatchWildcards = True
    .Forward = True
    .Format = True
    .Execute Replace:=wdReplaceAll
  End With
End With
Application.ScreenUpdating = True
End Sub