Hmm, that looks like it would match fine. But I don't see how it would limit a string to containing any number of occurances of only two of the alternate codes?
In case I wasn't clear in my first posting, the regex should match on a string that is within the QC criteria, but fail if not. So:
Would be matched, but:
Wouldn't, because the N near the end introduces a third ambiguity code.
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