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Kindly correct me, but If I understand this correctly, the Palestine RegExp would be wrong here (the last part):

On page 6 of the supplied PDF we can see the convention:

The supplied PDF says the IBAN structure is PS2!n4!a21!c
The regex here shows /^(PS[0-9]{2})[A-Z]{4}\d{21}$/

So I would argue, that the \d{21} part should actually be [a-zA-Z0-9] or [A-Z0-9] (since we don't care about case, I think).

what do you think?