https://pages.nist.gov/800-63-3/sp800-63b.html
Verifiers SHOULD NOT impose other composition rules (e.g., requiring mixtures of different character types or prohibiting consecutively repeated characters) for memorized secrets.
Verifiers SHOULD NOT require memorized secrets to be changed arbitrarily (e.g., periodically). However, verifiers SHALL force a change if there is evidence of compromise of the authenticator.
As noted above, composition rules are commonly used in an attempt to increase the difficulty of guessing user-chosen passwords. Research has shown, however, that users respond in very predictable ways to the requirements imposed by composition rules. For example, a user that might have chosen "password" as their password would be relatively likely to choose "Password1" if required to include an uppercase letter and a number, or "Password1!" if a symbol is also required.