perf(regex): prefer native regex fallback

[LingyuCoder]

Summary

• try Rust native regex via RegexBuilder before falling back to regress
• keep the existing EndWith fast path ahead of the native-regex attempt
• add a .* match-all fast path in Algo::new so the default wrapped context regexp does not need backend regex compilation
• align flag handling with Turbopack for d/g/i/m/s/u, while keeping sticky y on regress for correctness outside the .* fast path
• normalize escaped JS regex slashes (\/) before constructing Rust regex
• port relevant Turbopack behavior tests for simple native regex, negative lookahead fallback, invalid regex, and the .* fast path

Validation

• cargo test -p rspack_regex
• cargo check -p rspack --lib
• cargo fmt --all --check
• git diff --check

[github-actions]

📦 Binary Size-limit

Comparing 6cab50a to feat(css): add support for css/global module type (#13988) by AsyncIter

❌ Size increased by 12.00KB from 61.92MB to 61.94MB (⬆️0.02%)

[github-actions]

Rsdoctor Bundle Diff Analysis

⚠️ Note: The latest commit (400d3d7c3e) does not have baseline artifacts. Using commit f5cdf19587 for baseline comparison instead. If this seems incorrect, please wait a few minutes and try rerunning the workflow.

Found 6 projects in monorepo, 0 projects with changes.

📊 Quick Summary

Project	Total Size	Change
popular-libs	1.7 MB	0
react-10k	5.7 MB	0
react-1k	826.3 KB	0
react-5k	2.7 MB	0
rome	1.6 MB	0
ui-components	4.8 MB	0

Generated by Rsdoctor GitHub Action

[codspeed-hq]

Merging this PR will not alter performance

✅ 34 untouched benchmarks
⏩ 25 skipped benchmarks¹

---

_{Comparing codex/native-regex-first (6cab50a) with main (f5cdf19)}

Footnotes

1. 25 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[LingyuCoder]

@copilot remove "unicode-case" feature of regex crate

[Copilot]

@copilot remove "unicode-case" feature of regex crate

Done in eef0be3 (with follow-up fixes in 933d255 and cce2542): removed unicode-case from the workspace regex dependency and adjusted native-regex fallback/tests accordingly. No UI changes in this PR, so no screenshot applies.

[cloudflare-workers-and-pages]

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