No...from what I understand, the regulators don't. The ABA Risk Management Forum had a session on it. If I remember correctly the ABA and some mega banks own it...I don't see how a regulator could "require" it.
http://www.aba.com/Tools/Function/Cyber/Pages/dotbank.aspxThe new .BANK web domain is the place for growth and innovation in the financial services industry. Directed by banking and security experts, .BANK is a trusted, verified and more secure location online for banks, their customers and their stakeholders. All .BANK domains must meet enhanced security requirements and only verified members of the global banking community will be approved.
Be ready when .BANK launches on June 23, 2015 at 8:00 p.m. EDT. Prepare now by researching the different approved registrars and learning how to pre-verify with one that best fits your bank's needs. For more information, visit www.register.bank​.​​​​​​​​​​​