> One data point I can provide is: $900,000,000.00 — which is the cost for a bank for NOT doing this.

(It's not at all clear that this fine is due to a lack of regexes.)

If the argument is "banks have to do this because of non-sensical and unjust regulations" - fine, that's one for the lawyers and maybe risk managers.

I understood your position as defending the regulations itself.

In the case of BNP Paribas, 10 times that.