I think you're right, \d should be strictly equivalent to [0-9]. That's the way it worked pre-unicode, and I suspect a lot of code still uses it this way. The author would be quite surprised to see that their regexp actually matches non-traditional digits, and it could be a potential security problem.
I don't really like the /b, for broken, modifier. Maybe /t (traditional?) or /c (classical) if they aren't already used (I don't believe they are).
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