QA Verifier false negatives

I have the simple requirement, a number such as "1 bis" should be verified as being translated as "1a", where the number can be one or more digits.

The following regex set makes this validation:

Regex source: \b(d+)\sbis\b

Regex target: \b$1a\b

Condition: Grouped search expression - report if source matches but not target

But also fails to report "false negatives" for, as example, "2 bis" as source segment

1a (fails, OK)

2a (correct, OK)

21a (false negative)

121a (false negative)

When I summarise the messages, it appears that it suffices for the source number to appear somewhere in the target.
Where is my error? 

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