So I think I've figured out the find and replace finally.
Capture.JPG
Code:
Sub AddFullStop()
Application.ScreenUpdating = False
Selection.HomeKey Unit:=wdStory
With Selection.Find
.ClearFormatting
.Forward = True
.Wrap = wdFindContinue
.Format = True
.MatchWildcards = True
.Replacement.ClearFormatting
.text = "(^13)([0-9]@)([ ^t])"
.Replacement.text = "\1\2.\3"
.Execute Replace:=wdReplaceAll
End With
Application.ScreenUpdating = True
End Sub