Support for ES2025 RegExp duplicate named capturing groups

[btmills]

Syntax name

Duplicate named capturing groups

Syntax proposal URL

https://github.com/tc39/proposal-duplicate-named-capturing-groups

Example code

str.match(/(?<year>[0-9]{4})-[0-9]{2}|[0-9]{2}-(?<year>[0-9]{4})/)

Implementation Checklist

• [ ] Ecma262 update:
• [X] ESTree update:
• [ ] Acorn update:
• [X] eslint-visitor-keys update:
• [ ] espree update:
• [X] eslint-scope update:
• [ ] eslint update:

Participation

• [X] I am willing to submit a pull request for this change.

Additional comments

No response

[mayil-ai[bot]]

• Update the REGEXPP_LATEST_ECMA_VERSION constant to 2025 in the regular-expressions.js utility file to support ES2025 RegExp features:

  // lib/rules/utils/regular-expressions.js
  const REGEXPP_LATEST_ECMA_VERSION = 2025;

• Review the following ESLint rules to accommodate duplicate named capturing groups in regular expressions: no-useless-backreference.js, require-unicode-regexp.js, prefer-named-capture-group.js, and no-invalid-regexp.js. Modify their logic and processing as necessary.
• Revise the documentation for the rules prefer-named-capture-group, require-unicode-regexp, and no-invalid-regexp to include information and examples about the support for duplicate named capturing groups.
• Create new test cases for each of the updated rules to ensure they handle the new RegExp syntax correctly.
• Confirm that the Espree parser supports the new RegExp syntax. If it does not, work with the Espree maintainers or contribute to its update to ensure ESLint rules will function correctly with the new syntax.

Code snippets to check

• lib/rules/require-unicode-regexp.js:12-125 | Snippet includes logic for enforcing unicode flag in regex, relevant to RegExp named groups issue.

• lib/rules/utils/regular-expressions.js:1-42 | Contains utility function to validate regex patterns with 'u' flag, crucial for ES2025 RegExp support.

• lib/rules/prefer-named-capture-group.js:1-85 | Addresses named capture groups in regex, directly related to the issue's syntax proposal.

• lib/rules/no-useless-backreference.js:166-193 | Checks regex patterns in literals and global references, may need updates for new RegExp features.