Paul,

Yes that makes sense. Thanks. I have a feeling that blah, blah may actually be lengthy text in some cases so I've plugged your expression into a macro for her:

Sub ScratchMacro()
'A basic Word macro coded by Greg Maxey, http://gregmaxey.com/word_tips.html, 12/27/2017
Dim oRng As Word.Range
Dim oRngDup As Word.Range
  Set oRng = ActiveDocument.Range
    With oRng.Find
      .Text = "^13([A-z.]@ [A-z]@>)[!^13]@^13\1"
      .MatchWildcards = True
      While .Execute
        Set oRngDup = oRng.Duplicate
        oRng.Select
        With oRngDup
          .Start = oRngDup.Paragraphs(3).Range.Start
          .Collapse wdCollapseStart
          .MoveEnd wdWord, 2
          .HighlightColorIndex = wdRed
        End With
        oRng.Collapse wdCollapseEnd
      Wend
    End With
lbl_Exit:
  Exit Sub
End Sub