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According to below sources, IBAN numbers are a maximum of 34 characters and always start with two letters and two digits (ex. NL08).
The BBAN (after the first four characters) can be case-insensitive alphanumeric.
This PR fixes the mask in the documentation to allow for these variations.
Sources:
https://en.wikipedia.org/wiki/International_Bank_Account_Number
https://www.iban.com/structure.html