chore(deps): update rust crate regex to v1.12.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
regex	dependencies	minor	1.11.3 -> 1.12.1

---

Release Notes

rust-lang/regex (regex)

v1.12.1

Compare Source

===================
This release makes a bug fix in the new regex::Captures::get_match API
introduced in 1.12.0. There was an oversight with the lifetime parameter
for the Match returned. This is technically a breaking change, but given
that it was caught almost immediately and I've yanked the 1.12.0 release,
I think this is fine.

v1.12.0

Compare Source

===================
This release contains a smattering of bug fixes, a fix for excessive memory
consumption in some cases and a new regex::Captures::get_match API.

Improvements:

• FEATURE #​1146:
  Add Capture::get_match for returning the overall match without unwrap().

Bug fixes:

• BUG #​1083:
  Fixes a panic in the lazy DFA (can only occur for especially large regexes).
• BUG #​1116:
  Fixes a memory usage regression for large regexes (introduced in regex 1.9).
• BUG #​1195:
  Fix universal start states in sparse DFA.
• BUG #​1295:
  Fixes a panic when deserializing a corrupted dense DFA.
• BUG 8f5d9479:
  Make regex_automata::meta::Regex::find consistently return None when
  WhichCaptures::None is used.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[claude]

Pull Request Review - Regex Update to v1.12.1

Summary

This PR updates the regex crate from 1.11.3 to 1.12.1, which includes bug fixes and a memory usage improvement. The change is a Renovate bot automated dependency update.

---

✅ Code Quality & Best Practices

APPROVED - This is a standard dependency update with no code changes required.

• Changes: Only Cargo.lock is modified (version hashes updated)
• Scope: Minimal surface area - lockfile only
• Automation: Properly managed by Renovate with automerge enabled

---

✅ Potential Bugs or Issues

NO CONCERNS

The regex crate is used in src/commits/commit/mod.rs:1 for parsing Conventional Commit messages. The update includes:

1. Bug Fixes (from changelog):

   • Fixed panic in lazy DFA for large regexes
   • Fixed memory usage regression (introduced in regex 1.9)
   • Fixed universal start states in sparse DFA
   • Fixed panic when deserializing corrupted dense DFA
   • Fixed find to consistently return None with WhichCaptures::None

2. Impact Assessment:

   • Your regex patterns are simple and use basic character classes ([[:digit:]], [[:alpha:]], [[:space:]])
   • The patterns are for matching conventional commit formats (e.g., feat:, fix:, BREAKING CHANGE:)
   • No breaking changes - The update from v1.11.3 → v1.12.1 is backwards compatible

---

✅ Performance Considerations

POSITIVE IMPACT

From the changelog:

Fixes a memory usage regression for large regexes (introduced in regex 1.9)

This is particularly relevant since:

• The crate uses lazy_static! to compile regexes once at startup
• Regex matching happens for every commit message processed
• Memory improvements will benefit CI/CD pipelines processing many commits

Recommendation: This update should improve memory efficiency without any performance degradation.

---

✅ Security Concerns

NO SECURITY ISSUES

• The regex patterns in your codebase are statically defined (not user-provided)
• All patterns are compiled at build time via lazy_static!
• No regex denial-of-service (ReDoS) risk from this update
• The bug fixes actually improve stability (preventing panics)

---

✅ Test Coverage

EXCELLENT COVERAGE

I reviewed the test suite in src/commits/commit/tests/:

• Comprehensive parameterized tests using rstest
• Tests cover:
  • Major version increments (title & footer)
  • Minor version increments (feat)
  • Patch version increments (fix)
  • Edge cases (whitespace, invalid scopes, etc.)
  • Generated test variations

Example test file: src/commits/commit/tests/commit/major/title/mod.rs

The existing test suite will validate that regex behavior remains consistent after the update.

---

Final Verdict: ✅ APPROVED

Recommendations:

1. ✅ Merge this PR - The update includes important bug fixes and memory improvements
2. ✅ Let CI validate - Existing tests will catch any regression
3. ✅ Monitor - Watch for the automerge to complete successfully

Summary of Benefits:

• 🐛 Bug fixes for edge case panics
• 🚀 Memory usage improvements
• 🔒 Stability improvements
• ⚡ No breaking changes
• ✅ Backwards compatible

No action required - this is a safe, beneficial dependency update that should be merged.