Perhaps something based on:
Code:
Sub Demo()
Application.ScreenUpdating = False
With ActiveDocument.Range.Find
.ClearFormatting
.Text = "STOP:[!^13]@NEXT:"
With .Replacement
.ClearFormatting
.Text = "^&"
.Font.ColorIndex = wdRed
End With
.Forward = True
.Wrap = wdFindStop
.Format = True
.MatchWildcards = True
.Execute Replace:=wdReplaceAll
End With
Application.ScreenUpdating = True
End Sub