HBP: Voldy meets his match

[fhmaneely]

You'll spoil your
appetite if
you that before 
supper....
the good
the bad
the spoiled

The note left in the locket in the basin:
To the Dark Lord.
 I know I will be dead long before you read this but I want you to 
know that it was I who discovered your secret. I have stolen the real 
Horcrux and intend to destroy it as soon as I can. I face death in 
the hope that when you meet your match, you will be mortal once more. 
RAB

Is RAB refering to someone specific in this note? The note writer 
seems to know LV will face someone equal, his match. Since popular 
theory is saying RAB is Regulus, then did he know of a person, 
possibly Harry, who was LV's match? It would be ironic if RAB was 
Regulus, and Sirius never knew of this good deed! 

Regards,
Fran