fix: lone surrogate regex matching + Script=Unknown Unicode data

Two fixes for built-ins/RegExp/property-escapes/generated (469/469 pass):

1. Lone surrogate regex matching (fixes 7 tests):
   - Change regex_exec() to take &[u16] instead of &str, preserving lone
     surrogates (U+D800..U+DFFF) that String::from_utf16_lossy() would
     replace with U+FFFD
   - Add value_to_u16() helper in value.rs that returns Vec<u16> directly
     for String values without lossy UTF-8 conversion
   - Update regexp_exec_dispatch / regexp_test_dispatch / regexp_abstract_exec
     to pass &[u16] through the exec chain

2. Script=Unknown Unicode data (fixes 2 tests):
   - regress crate had UNKNOWN = [Interval; 0] (empty table)
   - Copy regress source to regress-patched/, patch unicodetables.rs with
     733 Unicode 17.0 Script=Unknown intervals computed from Scripts.txt
   - Add [patch] to Cargo.toml to use local patched copy

Author: ssrlive

Cargo.toml

@@ -63,3 +63,6 @@ harness = false
 name = "bigint_bench"
 path = "benches/bigint_bench.rs"
 harness = false
+
+[patch."https://github.com/ssrlive/regress.git"]
+regress = { path = "regress-patched" }

ci/runner.js

@@ -352,7 +352,7 @@ const SLOW_TESTS = [
 
 // Skip entire directories whose tests are too slow
 const SLOW_DIRS = [
-  'built-ins/RegExp/property-escapes/generated',
+  // 'built-ins/RegExp/property-escapes/generated',
 ];
 
 /*

regress-patched/.cargo-ok

@@ -0,0 +1,11 @@
+---
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "daily"

regress-patched/.github/dependabot.yml

@@ -0,0 +1,31 @@
+name: autofix.ci
+on:
+  workflow_call:
+  pull_request:
+  push:
+    branches: [ "main" ]
+permissions:
+  contents: read
+
+jobs:
+  autofix:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: actions/cache@v5
+        with:
+          path: |
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+            target/
+          key: autofix-${{ hashFiles('**/Cargo.lock') }}
+          
+      - run: rustup toolchain install ${{ env.rust_clippy }} --profile minimal --component rustfmt --component clippy
+      - run: rustup default ${{ env.rust_clippy }}
+
+      - run: cargo clippy --fix --workspace
+      - run: cargo fmt --all
+
+      - uses: autofix-ci/action@7a166d7532b277f34e16238930461bf77f9d7ed8

regress-patched/.github/workflows/autofix.yml

@@ -0,0 +1,77 @@
+on:
+  pull_request:
+    branches:
+      - "**"
+  push:
+    branches:
+      - "**"
+
+name: Continuous integration
+
+jobs:
+  check:
+    name: Check
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo check --verbose
+
+  test:
+    name: Test Suite
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        features:
+          - ""
+          - "index-positions"
+          - "prohibit-unsafe"
+          - "utf16"
+          - "index-positions,prohibit-unsafe"
+          - "index-positions,utf16"
+          - "prohibit-unsafe,utf16"
+          - "index-positions,prohibit-unsafe,utf16"
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo test --features "${{ matrix.features }}" --verbose
+
+  clippy:
+    name: Clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo clippy --all-targets --features "backend-pikevm,std,index-positions,prohibit-unsafe,utf16" -- -D warnings
+
+  test-nightly:
+    name: Test (Nightly)
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@nightly
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo test --all-features --verbose
+
+  doc:
+    name: Documentation
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v5
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+      - run: cargo doc --verbose --document-private-items
+        env:
+          RUSTDOCFLAGS: -D warnings

regress-patched/.github/workflows/rust.yml

@@ -0,0 +1,20 @@
+/target
+**/*.rs.bk
+Cargo.lock
+.vscode
+.vscode/*
+.DS_Store
+regexp-pcre.js
+
+.claude/
+CLAUDE.md
+
+# Unicode Database Files
+DerivedCoreProperties.txt
+DerivedBinaryProperties.txt
+DerivedGeneralCategory.txt
+DerivedNormalizationProps.txt
+CaseFolding.txt
+emoji-data.txt
+PropList.txt
+Scripts.txt

regress-patched/.gitignore

@@ -0,0 +1,40 @@
+[package]
+name = "regress"
+version = "0.11.0"
+authors = ["ridiculousfish <corydoras@ridiculousfish.com>"]
+description = "A regular expression engine targeting EcmaScript syntax"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/ridiculousfish/regress"
+keywords = ["regex", "regexp"]
+edition = "2024"
+readme = "README.md"
+
+[workspace]
+members = ["regress-tool", "gen-unicode", "."]
+default-members = ["regress-tool", "."]
+
+[profile.release]
+
+[features]
+default = ["backend-pikevm", "std"]
+
+std = ["memchr/std"]
+
+# Enables the PikeVM backend.
+backend-pikevm = []
+
+# Prefers indexes to pointers for bytecode IP and string positions, for the paranoid.
+index-positions = []
+
+# Prohibits all uses of unsafe code, for the paranoid.
+prohibit-unsafe = []
+
+# Enables UTF-16 support. This disables some optimizations, so it should only be used when necessary.
+utf16 = []
+
+# Enables Pattern trait implementation for str::find, str::contains, etc.
+pattern = []
+
+[dependencies]
+hashbrown = "0.16.0"
+memchr = { version = "2.4.0", default-features = false }