The version of ESLint you are using.

7.27.0

The problem you want to solve.

Support RegExp match indices officially, as it has reached stage-4.
refs:
https://github.com/tc39/proposals/blob/master/finished-proposals.md
https://github.com/tc39/proposal-regexp-match-indices

Your take on the correct solution to problem.

• Ecma262 update: Normative: add RegExp Match Indices tc39/ecma262#1713
• Acorn update: Implement ES2022 RegExp Match Indices acornjs/acorn#1039
• regexppupdate: Supports ES2022 RegExp Match Indices mysticatea/regexpp#22
• espree update: Update: Support top-level await and regexp match indices js#505
• eslint update: Breaking: support new regex d flag (fixes #14640) #14653

We probably need to add d to the validFlags of the no-invalid-regexp rule.
We probably need to add d to the regex variable of the no-empty-character-class rule.

Are you willing to submit a pull request to implement this change?

I will submit a pull request.