I want to make sure I understand what you're saying here:

... For any decimal digit there are 15 single bit failures that could morph one digit into another valid decimal digit... And the possibility of single bit corruptions occurring is far more likely than the disappearance of all 10 digits that it would require before your regex would fail.

I don't think it's just a matter of "the disappearance of all 10 digits" -- it's any disruption of the expected 10-digit string (in combination with a preceding name string), such as might happen if, say, one or more processes are writing both stdout and stderr to a single file handle, asynchronously, so that warning messages might interrupt in the middle of normal report lines, rather than being neatly interleaved. (I've seen that happen -- it's ugly.)

Comparing the variety of corruptions of that sort to the limited set of bit inversions you speak of, that turn, e.g., a "5" (0x35) into a "7" or "4" or "1" (but excluding what should be equally likely corruptions that turn "5" into 'NAK' (0x15) or '%' (0x25) or "u" (0x75) or any of the non-ASCII outcomes with high bit set), how do you figure that those particular bit inversions are "far more likely"?

Having just read your other reply to me below, I gather that my "twisted stderr/stdout" example is not part of the OP's scenario -- unless the poster is doing something different from what you assumed... Anyway, thanks for that -- your assessment is helpful, as usual.