diff --git a/tools/warn.py b/tools/warn.py
index dc6aacd..2e7927a 100755
--- a/tools/warn.py
+++ b/tools/warn.py
@@ -1661,82 +1661,91 @@
 ]
 
 
+def project_name_and_pattern(name, pattern):
+  return [name, '(^|.*/)' + pattern + '/.*: warning:']
+
+
+def simple_project_pattern(pattern):
+  return project_name_and_pattern(pattern, pattern)
+
+
 # A list of [project_name, file_path_pattern].
 # project_name should not contain comma, to be used in CSV output.
 project_list = [
-    # pylint:disable=bad-whitespace,g-inconsistent-quotes,line-too-long
-    ['art',                 r"(^|.*/)art/.*: warning:"],
-    ['bionic',              r"(^|.*/)bionic/.*: warning:"],
-    ['bootable',            r"(^|.*/)bootable/.*: warning:"],
-    ['build',               r"(^|.*/)build/.*: warning:"],
-    ['cts',                 r"(^|.*/)cts/.*: warning:"],
-    ['dalvik',              r"(^|.*/)dalvik/.*: warning:"],
-    ['developers',          r"(^|.*/)developers/.*: warning:"],
-    ['development',         r"(^|.*/)development/.*: warning:"],
-    ['device',              r"(^|.*/)device/.*: warning:"],
-    ['doc',                 r"(^|.*/)doc/.*: warning:"],
+    simple_project_pattern('art'),
+    simple_project_pattern('bionic'),
+    simple_project_pattern('bootable'),
+    simple_project_pattern('build'),
+    simple_project_pattern('cts'),
+    simple_project_pattern('dalvik'),
+    simple_project_pattern('developers'),
+    simple_project_pattern('development'),
+    simple_project_pattern('device'),
+    simple_project_pattern('doc'),
     # match external/google* before external/
-    ['external/google',     r"(^|.*/)external/google.*: warning:"],
-    ['external/non-google', r"(^|.*/)external/.*: warning:"],
-    ['frameworks/av/camera',r"(^|.*/)frameworks/av/camera/.*: warning:"],
-    ['frameworks/av/cmds',  r"(^|.*/)frameworks/av/cmds/.*: warning:"],
-    ['frameworks/av/drm',   r"(^|.*/)frameworks/av/drm/.*: warning:"],
-    ['frameworks/av/include',r"(^|.*/)frameworks/av/include/.*: warning:"],
-    ['frameworks/av/media', r"(^|.*/)frameworks/av/media/.*: warning:"],
-    ['frameworks/av/radio', r"(^|.*/)frameworks/av/radio/.*: warning:"],
-    ['frameworks/av/services', r"(^|.*/)frameworks/av/services/.*: warning:"],
-    ['frameworks/av/Other', r"(^|.*/)frameworks/av/.*: warning:"],
-    ['frameworks/base',     r"(^|.*/)frameworks/base/.*: warning:"],
-    ['frameworks/compile',  r"(^|.*/)frameworks/compile/.*: warning:"],
-    ['frameworks/minikin',  r"(^|.*/)frameworks/minikin/.*: warning:"],
-    ['frameworks/native',   r"(^|.*/)frameworks/native/.*: warning:"],
-    ['frameworks/opt',      r"(^|.*/)frameworks/opt/.*: warning:"],
-    ['frameworks/rs',       r"(^|.*/)frameworks/rs/.*: warning:"],
-    ['frameworks/webview',  r"(^|.*/)frameworks/webview/.*: warning:"],
-    ['frameworks/wilhelm',  r"(^|.*/)frameworks/wilhelm/.*: warning:"],
-    ['frameworks/Other',    r"(^|.*/)frameworks/.*: warning:"],
-    ['hardware/akm',        r"(^|.*/)hardware/akm/.*: warning:"],
-    ['hardware/broadcom',   r"(^|.*/)hardware/broadcom/.*: warning:"],
-    ['hardware/google',     r"(^|.*/)hardware/google/.*: warning:"],
-    ['hardware/intel',      r"(^|.*/)hardware/intel/.*: warning:"],
-    ['hardware/interfaces', r"(^|.*/)hardware/interfaces/.*: warning:"],
-    ['hardware/libhardware',r"(^|.*/)hardware/libhardware/.*: warning:"],
-    ['hardware/libhardware_legacy',r"(^|.*/)hardware/libhardware_legacy/.*: warning:"],
-    ['hardware/qcom',       r"(^|.*/)hardware/qcom/.*: warning:"],
-    ['hardware/ril',        r"(^|.*/)hardware/ril/.*: warning:"],
-    ['hardware/Other',      r"(^|.*/)hardware/.*: warning:"],
-    ['kernel',              r"(^|.*/)kernel/.*: warning:"],
-    ['libcore',             r"(^|.*/)libcore/.*: warning:"],
-    ['libnativehelper',     r"(^|.*/)libnativehelper/.*: warning:"],
-    ['ndk',                 r"(^|.*/)ndk/.*: warning:"],
+    project_name_and_pattern('external/google', 'external/google.*'),
+    project_name_and_pattern('external/non-google', 'external'),
+    simple_project_pattern('frameworks/av/camera'),
+    simple_project_pattern('frameworks/av/cmds'),
+    simple_project_pattern('frameworks/av/drm'),
+    simple_project_pattern('frameworks/av/include'),
+    simple_project_pattern('frameworks/av/media'),
+    simple_project_pattern('frameworks/av/radio'),
+    simple_project_pattern('frameworks/av/services'),
+    project_name_and_pattern('frameworks/av/Other', 'frameworks/av'),
+    simple_project_pattern('frameworks/base'),
+    simple_project_pattern('frameworks/compile'),
+    simple_project_pattern('frameworks/minikin'),
+    simple_project_pattern('frameworks/native'),
+    simple_project_pattern('frameworks/opt'),
+    simple_project_pattern('frameworks/rs'),
+    simple_project_pattern('frameworks/webview'),
+    simple_project_pattern('frameworks/wilhelm'),
+    project_name_and_pattern('frameworks/Other', 'frameworks'),
+    simple_project_pattern('hardware/akm'),
+    simple_project_pattern('hardware/broadcom'),
+    simple_project_pattern('hardware/google'),
+    simple_project_pattern('hardware/intel'),
+    simple_project_pattern('hardware/interfaces'),
+    simple_project_pattern('hardware/libhardware'),
+    simple_project_pattern('hardware/libhardware_legacy'),
+    simple_project_pattern('hardware/qcom'),
+    simple_project_pattern('hardware/ril'),
+    project_name_and_pattern('hardware/Other', 'hardware'),
+    simple_project_pattern('kernel'),
+    simple_project_pattern('libcore'),
+    simple_project_pattern('libnativehelper'),
+    simple_project_pattern('ndk'),
     # match vendor/unbungled_google/packages before other packages
-    ['unbundled_google',    r"(^|.*/)unbundled_google/.*: warning:"],
-    ['packages',            r"(^|.*/)packages/.*: warning:"],
-    ['pdk',                 r"(^|.*/)pdk/.*: warning:"],
-    ['prebuilts',           r"(^|.*/)prebuilts/.*: warning:"],
-    ['system/bt',           r"(^|.*/)system/bt/.*: warning:"],
-    ['system/connectivity', r"(^|.*/)system/connectivity/.*: warning:"],
-    ['system/core',         r"(^|.*/)system/core/.*: warning:"],
-    ['system/extras',       r"(^|.*/)system/extras/.*: warning:"],
-    ['system/gatekeeper',   r"(^|.*/)system/gatekeeper/.*: warning:"],
-    ['system/keymaster',    r"(^|.*/)system/keymaster/.*: warning:"],
-    ['system/libhwbinder',  r"(^|.*/)system/libhwbinder/.*: warning:"],
-    ['system/media',        r"(^|.*/)system/media/.*: warning:"],
-    ['system/netd',         r"(^|.*/)system/netd/.*: warning:"],
-    ['system/security',     r"(^|.*/)system/security/.*: warning:"],
-    ['system/sepolicy',     r"(^|.*/)system/sepolicy/.*: warning:"],
-    ['system/tools',        r"(^|.*/)system/tools/.*: warning:"],
-    ['system/vold',         r"(^|.*/)system/vold/.*: warning:"],
-    ['system/Other',        r"(^|.*/)system/.*: warning:"],
-    ['toolchain',           r"(^|.*/)toolchain/.*: warning:"],
-    ['test',                r"(^|.*/)test/.*: warning:"],
-    ['tools',               r"(^|.*/)tools/.*: warning:"],
+    simple_project_pattern('unbundled_google'),
+    simple_project_pattern('packages'),
+    simple_project_pattern('pdk'),
+    simple_project_pattern('prebuilts'),
+    simple_project_pattern('system/bt'),
+    simple_project_pattern('system/connectivity'),
+    simple_project_pattern('system/core'),
+    simple_project_pattern('system/extras'),
+    simple_project_pattern('system/gatekeeper'),
+    simple_project_pattern('system/keymaster'),
+    simple_project_pattern('system/libhwbinder'),
+    simple_project_pattern('system/media'),
+    simple_project_pattern('system/netd'),
+    simple_project_pattern('system/security'),
+    simple_project_pattern('system/sepolicy'),
+    simple_project_pattern('system/tools'),
+    simple_project_pattern('system/vold'),
+    project_name_and_pattern('system/Other', 'system'),
+    simple_project_pattern('toolchain'),
+    simple_project_pattern('test'),
+    simple_project_pattern('tools'),
     # match vendor/google* before vendor/
-    ['vendor/google',       r"(^|.*/)vendor/google.*: warning:"],
-    ['vendor/non-google',   r"(^|.*/)vendor/.*: warning:"],
+    project_name_and_pattern('vendor/google', 'vendor/google.*'),
+    project_name_and_pattern('vendor/non-google', 'vendor'),
     # keep out/obj and other patterns at the end.
-    ['out/obj', r".*/(gen|obj[^/]*)/(include|EXECUTABLES|SHARED_LIBRARIES|STATIC_LIBRARIES|NATIVE_TESTS)/.*: warning:"],
-    ['other',   r".*: warning:"],
+    ['out/obj',
+     '.*/(gen|obj[^/]*)/(include|EXECUTABLES|SHARED_LIBRARIES|'
+     'STATIC_LIBRARIES|NATIVE_TESTS)/.*: warning:'],
+    ['other', '.*']  # all other unrecognized patterns
 ]
 
 project_patterns = []