Use
Code:
Selection.HomeKey wdStory
Selection.Find.ClearFormatting
With Selection.Find
Do While .Execute(FindText:="\(insert * emoji\)", MatchWildcards:=True, Forward:=True, Wrap:=wdFindStop) = True
With Selection
If MsgBox("Click OK to colorize selection", vbOKCancel) = vbOK Then
.Range.Shading.BackgroundPatternColor = wdColorYellow
End If
.Collapse wdCollapseEnd
End With
Loop
End With
If you just want the colorizing to happen without click OK each time, delete the If and EndIf lines, leaving the .Range.Shading.BackgroundPatternColor = wdColorYellow line.