diff --git a/git_cl.py b/git_cl.py
index 85b212c7e..a92cafe50 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -2467,7 +2467,7 @@ class _GerritChangelistImpl(_ChangelistCodereviewBase):
       part = parsed_url.fragment
     else:
       part = parsed_url.path
-    match = re.match('(/c(/.*/\+)?)?/(\d+)(/(\d+)?/?)?$', part)
+    match = re.match(r'(/c(/.*/\+)?)?/(\d+)(/(\d+)?/?)?$', part)
     if match:
       return _ParsedIssueNumberArgument(
           issue=int(match.group(3)),
diff --git a/man/src/filter_demo_output.py b/man/src/filter_demo_output.py
index 92816db7c..5a506f61e 100755
--- a/man/src/filter_demo_output.py
+++ b/man/src/filter_demo_output.py
@@ -66,7 +66,7 @@ def main():
   backend = sys.argv[1]
   output = sys.stdin.read().rstrip()
 
-  callout_re = re.compile('\x1b\[(\d+)c\n')
+  callout_re = re.compile(r'\x1b\[(\d+)c\n')
   callouts = collections.defaultdict(int)
   for i, line in enumerate(output.splitlines(True)):
     m = callout_re.match(line)
diff --git a/owners.py b/owners.py
index 1efd5560b..973b2ab5b 100644
--- a/owners.py
+++ b/owners.py
@@ -308,7 +308,7 @@ class Database(object):
       line = line.strip()
       if line.startswith('#'):
         if is_toplevel:
-          m = re.match('#\s*OWNERS_STATUS\s+=\s+(.+)$', line)
+          m = re.match(r'#\s*OWNERS_STATUS\s+=\s+(.+)$', line)
           if m:
             self._status_file = m.group(1).strip()
             continue
diff --git a/patch.py b/patch.py
index 1bc608c9f..63209bb1f 100644
--- a/patch.py
+++ b/patch.py
@@ -60,7 +60,7 @@ class FilePatchBase(object):
     if filename == 'CON':
       raise UnsupportedPatchFormat(
           filename, 'Filename can\'t be \'CON\'.')
-    if re.match('COM\d', filename):
+    if re.match(r'COM\d', filename):
       raise UnsupportedPatchFormat(
           filename, 'Filename can\'t be \'%s\'.' % filename)
     return filename
diff --git a/scm.py b/scm.py
index b30b14cfd..9b3a7b850 100644
--- a/scm.py
+++ b/scm.py
@@ -147,7 +147,7 @@ class GIT(object):
         # 3-way merges can cause the status can be 'MMM' instead of 'M'. This
         # can happen when the user has 2 local branches and he diffs between
         # these 2 branches instead diffing to upstream.
-        m = re.match('^(\w)+\t(.+)$', statusline)
+        m = re.match(r'^(\w)+\t(.+)$', statusline)
         if not m:
           raise gclient_utils.Error(
               'status currently unsupported: %s' % statusline)
diff --git a/testing_support/gerrit_test_case.py b/testing_support/gerrit_test_case.py
index bc95694f2..ce93170ff 100644
--- a/testing_support/gerrit_test_case.py
+++ b/testing_support/gerrit_test_case.py
@@ -77,7 +77,7 @@ class GerritTestCase(unittest.TestCase):
   """
 
   COMMIT_RE = re.compile(r'^commit ([0-9a-fA-F]{40})$')
-  CHANGEID_RE = re.compile('^\s+Change-Id:\s*(\S+)$')
+  CHANGEID_RE = re.compile(r'^\s+Change-Id:\s*(\S+)$')
   DEVNULL = open(os.devnull, 'w')
   TEST_USERNAME = 'test-username'
   TEST_EMAIL = 'test-username@test.org'
diff --git a/upload_to_google_storage.py b/upload_to_google_storage.py
index 031214d6a..2f5ffc7d1 100755
--- a/upload_to_google_storage.py
+++ b/upload_to_google_storage.py
@@ -77,7 +77,7 @@ def _upload_worker(
     if gsutil.check_call('ls', file_url)[0] == 0 and not force:
       # File exists, check MD5 hash.
       _, out, _ = gsutil.check_call_with_retries('ls', '-L', file_url)
-      etag_match = re.search('ETag:\s+([a-z0-9]{32})', out)
+      etag_match = re.search(r'ETag:\s+([a-z0-9]{32})', out)
       if etag_match:
         remote_md5 = etag_match.group(1)
         # Calculate the MD5 checksum to match it to Google Storage's ETag.