diff --git a/.appveyor.yml b/.appveyor.yml
index c8bf89e0d6..ea9b81aa47 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -11,7 +11,7 @@ clone_depth: 10
 platform:
   - x64
 skip_commits:
-  message: /^\[DOC\]/
+  message: /\[DOC\]/
   files:
     - doc/*
     - '**/*.md'
diff --git a/.github/workflows/baseruby.yml b/.github/workflows/baseruby.yml
index 7385fc4d9e..1c314da911 100644
--- a/.github/workflows/baseruby.yml
+++ b/.github/workflows/baseruby.yml
@@ -20,7 +20,7 @@ jobs:
   baseruby:
     name: BASERUBY
     runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     strategy:
       matrix:
         ruby:
diff --git a/.github/workflows/check_dependencies.yml b/.github/workflows/check_dependencies.yml
index f606a86b66..6834d2c9c8 100644
--- a/.github/workflows/check_dependencies.yml
+++ b/.github/workflows/check_dependencies.yml
@@ -22,7 +22,7 @@ jobs:
         os: [ubuntu-20.04]
       fail-fast: true
     runs-on: ${{ matrix.os }}
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     steps:
       - name: Install libraries
         run: |
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 09d9135fa0..299c6b220a 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -23,7 +23,7 @@ jobs:
 
     # CodeQL runs on ubuntu-latest and windows-latest
     runs-on: ubuntu-latest
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
 
     env:
       enable_install_doc: no
diff --git a/.github/workflows/compilers.yml b/.github/workflows/compilers.yml
index d2e4c00613..2878d14a8c 100644
--- a/.github/workflows/compilers.yml
+++ b/.github/workflows/compilers.yml
@@ -212,7 +212,7 @@ jobs:
     container:
       image: ghcr.io/ruby/ruby-ci-image:${{ matrix.entry.container || 'clang-14' }}
       options: --user root
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     env: ${{ matrix.entry.env || matrix.env }}
     steps:
       - run: id
diff --git a/.github/workflows/mingw.yml b/.github/workflows/mingw.yml
index 8e3aec6e6f..3902c34edb 100644
--- a/.github/workflows/mingw.yml
+++ b/.github/workflows/mingw.yml
@@ -42,7 +42,7 @@ jobs:
             base_ruby: head
             test_task: "check" # to make job names consistent
       fail-fast: false
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     steps:
       - run: mkdir build
         working-directory:
diff --git a/.github/workflows/mjit.yml b/.github/workflows/mjit.yml
index d5d9cecc56..c2479f9467 100644
--- a/.github/workflows/mjit.yml
+++ b/.github/workflows/mjit.yml
@@ -23,7 +23,7 @@ jobs:
         jit_opts: [ "--mjit", "--mjit-wait" ]
       fail-fast: false
     runs-on: ubuntu-latest
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     env:
       TESTOPTS: '-q --tty=no'
       RUN_OPTS: '--disable-gems ${{ matrix.jit_opts }} --mjit-debug=-ggdb3'
diff --git a/.github/workflows/spec_guards.yml b/.github/workflows/spec_guards.yml
index 18e2d3c1a8..480731ad93 100644
--- a/.github/workflows/spec_guards.yml
+++ b/.github/workflows/spec_guards.yml
@@ -20,7 +20,7 @@ jobs:
   rubyspec:
     name: Rubyspec
     runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     strategy:
       matrix:
         # Specs from ruby/spec should still run on all supported Ruby versions.
diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index b7097cca53..4aa87258f9 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -37,7 +37,7 @@ jobs:
       GITPULLOPTIONS: --no-tags origin ${{github.ref}}
       RUBY_DEBUG: ci
     runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     steps:
       - run: mkdir build
         working-directory:
diff --git a/.github/workflows/wasm.yml b/.github/workflows/wasm.yml
index db00db9009..5459db8ae2 100644
--- a/.github/workflows/wasm.yml
+++ b/.github/workflows/wasm.yml
@@ -38,7 +38,7 @@ jobs:
       BINARYEN_VERSION: 91
       WASMTIME_VERSION: v0.33.0
     runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     steps:
       - run: mkdir build
         working-directory:
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 9c9d7b9da0..2c5b823d20 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -24,7 +24,7 @@ jobs:
           - vs: 2022
       fail-fast: false
     runs-on: windows-${{ matrix.vs < 2022 && '2019' || matrix.vs }}
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     name: VisualStudio ${{ matrix.vs }}
     env:
       GITPULLOPTIONS: --no-tags origin ${{github.ref}}
diff --git a/.github/workflows/yjit-ubuntu.yml b/.github/workflows/yjit-ubuntu.yml
index cf96590b60..5a86acb62c 100644
--- a/.github/workflows/yjit-ubuntu.yml
+++ b/.github/workflows/yjit-ubuntu.yml
@@ -62,7 +62,7 @@ jobs:
       RUN_OPTS: ${{ matrix.yjit_opts }}
       RUBY_DEBUG: ci
     runs-on: ubuntu-20.04
-    if: ${{ !startsWith(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
+    if: ${{ !contains(github.event.head_commit.message, '[DOC]') && !contains(github.event.pull_request.labels.*.name, 'Documentation') }}
     steps:
       - run: mkdir build
         working-directory:
diff --git a/.travis.yml b/.travis.yml
index a34d3692af..6875c766a9 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,7 +13,7 @@ language: c
 
 os: linux
 
-if: commit_message !~ /^\[DOC\]/
+if: commit_message !~ /\[DOC\]/
 
 dist: focal