diff --git a/third_party/regress/.cargo-ok b/third_party/regress/.cargo-ok
deleted file mode 100644
index 5f8b7958..00000000
--- a/third_party/regress/.cargo-ok
+++ /dev/null
@@ -1 +0,0 @@
-{"v":1}
\ No newline at end of file
diff --git a/third_party/regress/.cargo_vcs_info.json b/third_party/regress/.cargo_vcs_info.json
deleted file mode 100644
index 09dffdfe..00000000
--- a/third_party/regress/.cargo_vcs_info.json
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "git": {
-    "sha1": "7e64ad5e6807b5503e5cc97a79e0f129b23c556b",
-    "dirty": true
-  },
-  "path_in_vcs": ""
-}
\ No newline at end of file
diff --git a/third_party/regress/.github/dependabot.yml b/third_party/regress/.github/dependabot.yml
deleted file mode 100644
index 8ab9c505..00000000
--- a/third_party/regress/.github/dependabot.yml
+++ /dev/null
@@ -1,11 +0,0 @@
----
-version: 2
-updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "daily"
-  - package-ecosystem: "cargo"
-    directory: "/"
-    schedule:
-      interval: "daily"
diff --git a/third_party/regress/.github/workflows/autofix.yml b/third_party/regress/.github/workflows/autofix.yml
deleted file mode 100644
index b653cb3b..00000000
--- a/third_party/regress/.github/workflows/autofix.yml
+++ /dev/null
@@ -1,31 +0,0 @@
-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
diff --git a/third_party/regress/.github/workflows/rust.yml b/third_party/regress/.github/workflows/rust.yml
deleted file mode 100644
index 7b45c54e..00000000
--- a/third_party/regress/.github/workflows/rust.yml
+++ /dev/null
@@ -1,77 +0,0 @@
-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