I need to extract the ABA number, checking account number and the check number from the string of numbers at the bottom of a check.

Has anyone done this before? I understand that the numbers may be in any sequence...

i.e.

account number / ABA number / check number
ABA number / account number / check number
ABA number / check number / account number
.
.
.

I have a database of ABA numbers I can use to determine which part of the number is the ABA, but I'm stuck trying to extract the rest...

TIA