Bug 1879120 - Remove all python deprecation warning: invalid escape sequence r=ahochheiden,webdriver-reviewers,perftest-reviewers,afinder UPGRADE_NSPR_RELEASE

Differential Revision: https://phabricator.services.mozilla.com/D201012

build/pgo/genpgocert.py

@@ -20,9 +20,9 @@ from mozfile import NamedTemporaryFile, TemporaryDirectory
 from mozprofile.permissions import ServerLocations
 
 dbFiles = [
-    re.compile("^cert[0-9]+\.db$"),
+    re.compile(r"^cert[0-9]+\.db$"),
-    re.compile("^key[0-9]+\.db$"),
+    re.compile(r"^key[0-9]+\.db$"),
-    re.compile("^secmod\.db$"),
+    re.compile(r"^secmod\.db$"),
 ]
 
 
@@ -77,7 +77,7 @@ def writeCertspecForServerLocations(fd):
         i for i in iter(locations) if i.scheme == "https" and "nocert" not in i.options
     ]:
         customCertOption = False
-        customCertRE = re.compile("^cert=(?:\w+)")
+        customCertRE = re.compile(r"^cert=(?:\w+)")
         for _ in [i for i in loc.options if customCertRE.match(i)]:
             customCertOption = True
             break

dom/media/webrtc/third_party_build/filter_git_changes.py

@@ -48,7 +48,7 @@ def filter_git_changes(github_path, commit_sha, diff_filter):
     # out the excluded directory paths (note the lack of trailing '$'
     # in the regex).
     regex_excludes = "|".join(
-        ["^(M|A|D|R\d\d\d)\t{}".format(i) for i in exclude_dir_list]
+        ["^(M|A|D|R\\d\\d\\d)\t{}".format(i) for i in exclude_dir_list]
     )
     files_not_excluded = [
         path for path in changed_files if not re.findall(regex_excludes, path)

dom/media/webrtc/third_party_build/save_patch_stack.py

@@ -52,7 +52,7 @@ def save_patch_stack(
     # remove the commit summary from the file name
     patches_to_rename = os.listdir(patch_directory)
     for file in patches_to_rename:
-        shortened_name = re.sub("^(\d\d\d\d)-.*\.patch", "\\1.patch", file)
+        shortened_name = re.sub(r"^(\d\d\d\d)-.*\.patch", "\\1.patch", file)
         os.rename(
             os.path.join(patch_directory, file),
             os.path.join(patch_directory, shortened_name),

gfx/angle/update-angle.py

@@ -5,7 +5,7 @@
 
 assert __name__ == "__main__"
 
-"""
+r"""
 To update ANGLE in Gecko, use Windows with git-bash, and setup depot_tools, python2, and
 python3. Because depot_tools expects `python` to be `python2` (shame!), python2 must come
 before python3 in your path.

gfx/thebes/gencjkcisvs.py

@@ -9,7 +9,7 @@ import sys
 f = open(sys.argv[1] if len(sys.argv) > 1 else "StandardizedVariants.txt")
 
 line = f.readline()
-m = re.compile("^# (StandardizedVariants(-\d+(\.\d+)*)?\.txt)").search(line)
+m = re.compile(r"^# (StandardizedVariants(-\d+(\.\d+)*)?\.txt)").search(line)
 fileversion = m.group(1)
 vsdict = {}
 r = re.compile(

js/src/builtin/intl/make_intl_data.py

@@ -2213,7 +2213,7 @@ def listIANAFiles(tzdataDir):
 
 def readIANAFiles(tzdataDir, files):
     """Read all IANA time zone files from the given iterable."""
-    nameSyntax = "[\w/+\-]+"
+    nameSyntax = r"[\w/+\-]+"
     pZone = re.compile(r"Zone\s+(?P<name>%s)\s+.*" % nameSyntax)
     pLink = re.compile(
         r"Link\s+(?P<target>%s)\s+(?P<name>%s)(?:\s+#.*)?" % (nameSyntax, nameSyntax)
@@ -2310,7 +2310,7 @@ def readICUResourceFile(filename):
         maybeMultiComments = r"(?:/\*[^*]*\*/)*"
         maybeSingleComment = r"(?://.*)?"
         lineStart = "^%s" % maybeMultiComments
-        lineEnd = "%s\s*%s$" % (maybeMultiComments, maybeSingleComment)
+        lineEnd = r"%s\s*%s$" % (maybeMultiComments, maybeSingleComment)
         return re.compile(r"\s*".join(chain([lineStart], args, [lineEnd])))
 
     tableName = r'(?P<quote>"?)(?P<name>.+?)(?P=quote)'
@@ -2554,7 +2554,7 @@ def icuTzDataVersion(icuTzDir):
     zoneinfo = os.path.join(icuTzDir, "zoneinfo64.txt")
     if not os.path.isfile(zoneinfo):
         raise RuntimeError("file not found: %s" % zoneinfo)
-    version = searchInFile("^//\s+tz version:\s+([0-9]{4}[a-z])$", zoneinfo)
+    version = searchInFile(r"^//\s+tz version:\s+([0-9]{4}[a-z])$", zoneinfo)
     if version is None:
         raise RuntimeError(
             "%s does not contain a valid tzdata version string" % zoneinfo
@@ -3711,7 +3711,7 @@ const allUnits = {};
 """.format(
             all_units_array
         )
-        + """
+        + r"""
 // Test only sanctioned unit identifiers are allowed.
 
 for (const typeAndUnit of allUnits) {

js/src/frontend/align_stack_comment.py

@@ -22,7 +22,7 @@ ALIGNMENT_COLUMN = 20
 # The maximum column for comment
 MAX_CHARS_PER_LINE = 80
 
-stack_comment_pat = re.compile("^( *//) *(\[stack\].*)$")
+stack_comment_pat = re.compile(r"^( *//) *(\[stack\].*)$")
 
 
 def align_stack_comment(path):

js/src/gdb/mozilla/prettyprinters.py

@@ -271,7 +271,7 @@ def implemented_types(t):
         yield t2
 
 
-template_regexp = re.compile("([\w_:]+)<")
+template_regexp = re.compile(r"([\w_:]+)<")
 
 
 def is_struct_or_union(t):

js/src/gdb/run-tests.py

@@ -40,9 +40,9 @@ def _relpath(path, start=None):
 os.path.relpath = _relpath
 
 # Characters that need to be escaped when used in shell words.
-shell_need_escapes = re.compile("[^\w\d%+,-./:=@'\"]", re.DOTALL)
+shell_need_escapes = re.compile("[^\\w\\d%+,-./:=@'\"]", re.DOTALL)
 # Characters that need to be escaped within double-quoted strings.
-shell_dquote_escapes = re.compile('[^\w\d%+,-./:=@"]', re.DOTALL)
+shell_dquote_escapes = re.compile('[^\\w\\d%+,-./:=@"]', re.DOTALL)
 
 
 def make_shell_cmd(l):

js/src/gdb/tests/test-ExecutableAllocator.py

@@ -13,10 +13,10 @@ run_fragment("ExecutableAllocator.onepool")
 
 reExecPool = "ExecutablePool [a-f0-9]{8,}-[a-f0-9]{8,}"
 assert_regexp_pretty("pool", reExecPool)
-assert_regexp_pretty("execAlloc", "ExecutableAllocator\(\[" + reExecPool + "\]\)")
+assert_regexp_pretty("execAlloc", r"ExecutableAllocator\(\[" + reExecPool + r"\]\)")
 
 run_fragment("ExecutableAllocator.twopools")
 
 assert_regexp_pretty(
-    "execAlloc", "ExecutableAllocator\(\[" + reExecPool + ", " + reExecPool + "\]\)"
+    "execAlloc", r"ExecutableAllocator\(\[" + reExecPool + ", " + reExecPool + r"\]\)"
 )

js/src/tests/lib/tasks_adb_remote.py

@@ -160,7 +160,7 @@ do_test()
     #
     # The timeout command send a SIGTERM signal, which should return 143
     # (=128+15). However, due to a bug in tinybox, it returns 142.
-    if test \( $rc -eq 143 -o $rc -eq 142 \) -a $attempt -lt {retry}; then
+    if test \\( $rc -eq 143 -o $rc -eq 142 \\) -a $attempt -lt {retry}; then
       echo '\\n{tag}RETRY='$rc,$time
       attempt=$((attempt + 1))
       do_test $idx $attempt "$@"

js/src/tests/non262/String/make-normalize-generateddata-input.py

@@ -18,7 +18,7 @@ def to_code_list(codes):
 
 
 def convert(dir):
-    ver_pat = re.compile("NormalizationTest-([0-9\.]+)\.txt")
+    ver_pat = re.compile(r"NormalizationTest-([0-9\.]+)\.txt")
     part_pat = re.compile("^@(Part([0-9]+) .+)$")
     test_pat = re.compile(
         "^([0-9A-Fa-f ]+);([0-9A-Fa-f ]+);([0-9A-Fa-f ]+);([0-9A-Fa-f ]+);([0-9A-Fa-f ]+);$"

js/src/tests/test262-export.py

@@ -237,7 +237,7 @@ def mergeMeta(reftest, frontmatter, includes):
     if info:
         # Open some space in an existing info text
         if "info" in frontmatter:
-            frontmatter["info"] += "\n\n  \%s" % info
+            frontmatter["info"] += "\n\n  \\%s" % info
         else:
             frontmatter["info"] = info
 

js/src/util/make_unicode.py

@@ -1111,7 +1111,7 @@ def make_regexp_space_test(version, test_space_table, codepoint_table):
         test_space.write(",\n".join(map(hex_and_name, test_space_table)))
         test_space.write("\n);\n")
         test_space.write(
-            """
+            r"""
 assertEq(/^\s+$/.exec(onlySpace) !== null, true);
 assertEq(/^[\s]+$/.exec(onlySpace) !== null, true);
 assertEq(/^[^\s]+$/.exec(onlySpace) === null, true);

layout/tools/reftest/runreftest.py

@@ -252,7 +252,7 @@ class ReftestResolver(object):
                 rv = [
                     (
                         os.path.join(dirname, default_manifest),
-                        r".*%s(?:[#?].*)?$" % pathname.replace("?", "\?"),
+                        r".*%s(?:[#?].*)?$" % pathname.replace("?", r"\?"),
                     )
                 ]
 

media/libaom/cmakeparser.py

@@ -83,7 +83,7 @@ def substs(variables, values):
 
         # Safe substitute leaves unrecognized variables in place.
         # We replace them with the empty string.
-        new_values.append(re.sub('\$\{\w+\}', '', new_value))
+        new_values.append(re.sub(r'\$\{\w+\}', '', new_value))
     return new_values
 
 
@@ -240,7 +240,7 @@ def evaluate_boolean(variables, arguments):
         # If statements can have old-style variables which are not demarcated
         # like ${VARIABLE}. Attempt to look up the variable both ways.
         try:
-            if re.search('\$\{\w+\}', argument):
+            if re.search(r'\$\{\w+\}', argument):
                 try:
                     t = Template(argument)
                     value = t.substitute(variables)

nsprpub/automation/release/nspr-release-helper.py

@@ -46,13 +46,13 @@ def toggle_beta_status(is_beta):
     check_files_exist()
     if (is_beta):
         print("adding Beta status to version numbers")
-        sed_inplace('s/^\(#define *PR_VERSION *\"[0-9.]\+\)\" *$/\\1 Beta\"/', prinit_h)
+        sed_inplace('s/^\\(#define *PR_VERSION *\"[0-9.]\\+\\)\" *$/\\1 Beta\"/', prinit_h)
-        sed_inplace('s/^\(#define *PR_BETA *\)PR_FALSE *$/\\1PR_TRUE/', prinit_h)
+        sed_inplace('s/^\\(#define *PR_BETA *\\)PR_FALSE *$/\\1PR_TRUE/', prinit_h)
 
     else:
         print("removing Beta status from version numbers")
-        sed_inplace('s/^\(#define *PR_VERSION *\"[0-9.]\+\) *Beta\" *$/\\1\"/', prinit_h)
+        sed_inplace('s/^\\(#define *PR_VERSION *\"[0-9.]\\+\\) *Beta\" *$/\\1\"/', prinit_h)
-        sed_inplace('s/^\(#define *PR_BETA *\)PR_TRUE *$/\\1PR_FALSE/', prinit_h)
+        sed_inplace('s/^\\(#define *PR_BETA *\\)PR_TRUE *$/\\1PR_FALSE/', prinit_h)
     print("please run 'hg stat' and 'hg diff' to verify the files have been verified correctly")
 
 def print_beta_versions():
@@ -81,22 +81,22 @@ def ensure_arguments_after_action(how_many, usage):
         exit_with_failure("incorrect number of arguments, expected parameters are:\n" + usage)
 
 def set_major_versions(major):
-    sed_inplace('s/^\(#define *PR_VMAJOR *\).*$/\\1' + major + '/', prinit_h)
+    sed_inplace('s/^\\(#define *PR_VMAJOR *\\).*$/\\1' + major + '/', prinit_h)
     sed_inplace('s/^MOD_MAJOR_VERSION=.*$/MOD_MAJOR_VERSION=' + major + '/', f_conf)
     sed_inplace('s/^MOD_MAJOR_VERSION=.*$/MOD_MAJOR_VERSION=' + major + '/', f_conf_in)
 
 def set_minor_versions(minor):
-    sed_inplace('s/^\(#define *PR_VMINOR *\).*$/\\1' + minor + '/', prinit_h)
+    sed_inplace('s/^\\(#define *PR_VMINOR *\\).*$/\\1' + minor + '/', prinit_h)
     sed_inplace('s/^MOD_MINOR_VERSION=.*$/MOD_MINOR_VERSION=' + minor + '/', f_conf)
     sed_inplace('s/^MOD_MINOR_VERSION=.*$/MOD_MINOR_VERSION=' + minor + '/', f_conf_in)
 
 def set_patch_versions(patch):
-    sed_inplace('s/^\(#define *PR_VPATCH *\).*$/\\1' + patch + '/', prinit_h)
+    sed_inplace('s/^\\(#define *PR_VPATCH *\\).*$/\\1' + patch + '/', prinit_h)
     sed_inplace('s/^MOD_PATCH_VERSION=.*$/MOD_PATCH_VERSION=' + patch + '/', f_conf)
     sed_inplace('s/^MOD_PATCH_VERSION=.*$/MOD_PATCH_VERSION=' + patch + '/', f_conf_in)
 
 def set_full_lib_versions(version):
-    sed_inplace('s/^\(#define *PR_VERSION *\"\)\([0-9.]\+\)\(.*\)$/\\1' + version + '\\3/', prinit_h)
+    sed_inplace('s/^\\(#define *PR_VERSION *\"\\)\\([0-9.]\\+\\)\\(.*\\)$/\\1' + version + '\\3/', prinit_h)
 
 def set_all_lib_versions(version, major, minor, patch):
     set_full_lib_versions(version)

python/l10n/fluent_migrations/bug_1845150_search_engine_notification.py

@@ -10,7 +10,7 @@ class STRIP_LABEL(TransformPattern):
     # Used to remove `<label data-l10n-name="remove-search-engine-article">` from a string
     def visit_TextElement(self, node):
         node.value = re.sub(
-            '\s?<label data-l10n-name="remove-search-engine-article">.+?</label>\s?',
+            r'\s?<label data-l10n-name="remove-search-engine-article">.+?</label>\s?',
             "",
             node.value,
         )

python/mozbuild/mozbuild/action/langpack_manifest.py

@@ -375,7 +375,7 @@ def parse_chrome_manifest(path, base_path, chrome_entries):
 ###
 def get_version_maybe_buildid(app_version):
     def _extract_numeric_part(part):
-        matches = re.compile("[^\d]").search(part)
+        matches = re.compile(r"[^\d]").search(part)
         if matches:
             part = part[0 : matches.start()]
         if len(part) == 0:

python/mozbuild/mozbuild/backend/cpp_eclipse.py

@@ -171,14 +171,14 @@ class CppEclipseBackend(CommonBackend):
         # Here we generate the code formatter that will show up in the UI with
         # the name "Mozilla".  The formatter is stored as a single line of XML
         # in the org.eclipse.cdt.ui.formatterprofiles pref.
-        cdt_ui_prefs += """org.eclipse.cdt.ui.formatterprofiles=<?xml version\="1.0" encoding\="UTF-8" standalone\="no"?>\\n<profiles version\="1">\\n<profile kind\="CodeFormatterProfile" name\="Mozilla" version\="1">\\n"""
+        cdt_ui_prefs += r'org.eclipse.cdt.ui.formatterprofiles=<?xml version\="1.0" encoding\="UTF-8" standalone\="no"?>\n<profiles version\="1">\n<profile kind\="CodeFormatterProfile" name\="Mozilla" version\="1">\n'
-        XML_PREF_TEMPLATE = """<setting id\="@PREF_NAME@" value\="@PREF_VAL@"/>\\n"""
+        XML_PREF_TEMPLATE = r'<setting id\="@PREF_NAME@" value\="@PREF_VAL@"/>\n'
         for line in FORMATTER_SETTINGS.splitlines():
             [pref, val] = line.split("=")
             cdt_ui_prefs += XML_PREF_TEMPLATE.replace("@PREF_NAME@", pref).replace(
                 "@PREF_VAL@", val
             )
-        cdt_ui_prefs += "</profile>\\n</profiles>\\n"
+        cdt_ui_prefs += r"</profile>\n</profiles>\n"
         with open(cdt_ui_prefs_path, "w") as fh:
             fh.write(cdt_ui_prefs)
 

python/mozbuild/mozbuild/codecoverage/chrome_map.py

@@ -25,7 +25,7 @@ from mozbuild.frontend.data import (
 
 from .manifest_handler import ChromeManifestHandler
 
-_line_comment_re = re.compile('^//@line (\d+) "(.+)"$')
+_line_comment_re = re.compile(r'^//@line (\d+) "(.+)"$')
 
 
 def generate_pp_info(path, topsrcdir):

python/mozbuild/mozbuild/configure/check_debug_ranges.py

@@ -37,7 +37,7 @@ def get_range_length(range, debug_ranges):
     given offset."""
     length = 0
     for line in debug_ranges.splitlines():
-        m = re.match("\s*([0-9a-fA-F]+)\s+([0-9a-fA-F]+)\s+([0-9a-fA-F]+)", line)
+        m = re.match(r"\s*([0-9a-fA-F]+)\s+([0-9a-fA-F]+)\s+([0-9a-fA-F]+)", line)
         if m and int(m.group(1), 16) == range:
             length += 1
     return length

python/mozbuild/mozbuild/dotproperties.py

@@ -38,7 +38,7 @@ class DotProperties:
             line = l.strip()
             if not line or line.startswith("#"):
                 continue
-            (k, v) = re.split("\s*=\s*", line, 1)
+            (k, v) = re.split(r"\s*=\s*", line, 1)
             self._properties[k] = v
 
     def get(self, key, default=None):

python/mozbuild/mozbuild/repackaging/msix.py

@@ -813,7 +813,7 @@ def _sign_msix_win(output, force, log, verbose):
             thumbprint.strip()
             for thumbprint in powershell(
                 (
-                    "Get-ChildItem -Path Cert:\CurrentUser\My"
+                    r"Get-ChildItem -Path Cert:\CurrentUser\My"
                     '| Where-Object {{$_.Subject -Match "{}"}}'
                     '| Where-Object {{$_.FriendlyName -Match "{}"}}'
                     "| Select-Object -ExpandProperty Thumbprint"
@@ -838,7 +838,7 @@ def _sign_msix_win(output, force, log, verbose):
                     (
                         'New-SelfSignedCertificate -Type Custom -Subject "{}" '
                         '-KeyUsage DigitalSignature -FriendlyName "{}"'
-                        " -CertStoreLocation Cert:\CurrentUser\My"
+                        r" -CertStoreLocation Cert:\CurrentUser\My"
                         ' -TextExtension @("2.5.29.37={{text}}1.3.6.1.5.5.7.3.3", '
                         '"2.5.29.19={{text}}")'
                         "| Select-Object -ExpandProperty Thumbprint"
@@ -856,7 +856,7 @@ def _sign_msix_win(output, force, log, verbose):
             )
 
         powershell(
-            'Export-Certificate -Cert Cert:\CurrentUser\My\{} -FilePath "{}"'.format(
+            r'Export-Certificate -Cert Cert:\CurrentUser\My\{} -FilePath "{}"'.format(
                 thumbprint, crt_path
             )
         )
@@ -869,7 +869,7 @@ def _sign_msix_win(output, force, log, verbose):
 
         powershell(
             (
-                'Export-PfxCertificate -Cert Cert:\CurrentUser\My\{} -FilePath "{}"'
+                r'Export-PfxCertificate -Cert Cert:\CurrentUser\My\{} -FilePath "{}"'
                 ' -Password (ConvertTo-SecureString -String "{}" -Force -AsPlainText)'
             ).format(thumbprint, pfx_path, password)
         )
@@ -940,7 +940,7 @@ def _sign_msix_win(output, force, log, verbose):
         root_thumbprints = [
             root_thumbprint.strip()
             for root_thumbprint in powershell(
-                "Get-ChildItem -Path Cert:\LocalMachine\Root\{} "
+                r"Get-ChildItem -Path Cert:\LocalMachine\Root\{} "
                 "| Select-Object -ExpandProperty Thumbprint".format(thumbprint),
                 check=False,
             ).splitlines()

python/mozbuild/mozbuild/test/configure/test_toolchain_helpers.py

@@ -22,16 +22,16 @@ class CompilerPreprocessor(Preprocessor):
     # For now, we don't look very hard for C strings because they don't matter
     # that much for our unit tests, but we at least avoid expanding in the
     # simple "FOO" case.
-    VARSUBST = re.compile('(?<!")(?P<VAR>\w+)(?!")', re.U)
+    VARSUBST = re.compile(r'(?<!")(?P<VAR>\w+)(?!")', re.U)
-    NON_WHITESPACE = re.compile("\S")
+    NON_WHITESPACE = re.compile(r"\S")
     HAS_FEATURE_OR_BUILTIN = re.compile(
-        '(__has_(?:feature|builtin|attribute|warning))\("?([^"\)]*)"?\)'
+        r'(__has_(?:feature|builtin|attribute|warning))\("?([^"\)]*)"?\)'
     )
 
     def __init__(self, *args, **kwargs):
         Preprocessor.__init__(self, *args, **kwargs)
         self.do_filter("c_substitution")
-        self.setMarker("#\s*")
+        self.setMarker(r"#\s*")
 
     def do_if(self, expression, **kwargs):
         # The C preprocessor handles numbers following C rules, which is a

python/mozbuild/mozbuild/vendor/rewrite_mozbuild.py

@@ -822,7 +822,7 @@ def edit_moz_build_file_to_remove_file(
     """
 
     simple_file_line = re.compile(
-        "^\s*['\"]" + unnormalized_filename_to_remove + "['\"],*$"
+        "^\\s*['\"]" + unnormalized_filename_to_remove + "['\"],*$"
     )
     did_replace = False
 

python/mozbuild/mozbuild/vendor/vendor_manifest.py

@@ -612,7 +612,7 @@ class VendorManifest(MozbuildObject):
                 if r[0] in l:
                     print("Found " + l)
                     replaced += 1
-                    yaml[i] = re.sub(r[0] + " [v\.a-f0-9]+.*$", r[0] + r[1], yaml[i])
+                    yaml[i] = re.sub(r[0] + r" [v\.a-f0-9]+.*$", r[0] + r[1], yaml[i])
 
         assert len(replacements) == replaced
 

python/mozrelease/mozrelease/partner_repack.py

@@ -172,7 +172,7 @@ def parseRepackConfig(file: Path, platform: str):
             config[key] = value
             continue
         if key == "deb_section":
-            config["deb_section"] = re.sub("/", "\/", value)
+            config["deb_section"] = re.sub("/", r"\/", value)
             continue
         if isValidPlatform(key):
             ftp_platform = getFtpPlatform(key)

servo/components/style/gecko/regen_atoms.py

@@ -18,7 +18,7 @@ import build
 
 # Matches lines like `GK_ATOM(foo, "foo", 0x12345678, true, nsStaticAtom, PseudoElementAtom)`.
 PATTERN = re.compile(
-    '^GK_ATOM\(([^,]*),[^"]*"([^"]*)",\s*(0x[0-9a-f]+),\s*[^,]*,\s*([^,]*),\s*([^)]*)\)',
+    r'^GK_ATOM\(([^,]*),[^"]*"([^"]*)",\s*(0x[0-9a-f]+),\s*[^,]*,\s*([^,]*),\s*([^)]*)\)',
     re.MULTILINE,
 )
 FILE = "include/nsGkAtomList.h"

taskcluster/scripts/misc/are-we-esmified-yet.py

@@ -112,12 +112,12 @@ def collect_jsm(files):
 
     # js files with EXPORTED_SYMBOLS
     if mode == "hg":
-        cmd = ["hg", "files", "set:grep('EXPORTED_SYMBOLS = \[') and glob:**/*.js"]
+        cmd = ["hg", "files", r"set:grep('EXPORTED_SYMBOLS = \[') and glob:**/*.js"]
         for line in run(cmd):
             put_file(files, kind, pathlib.Path(line))
     else:
         handled = {}
-        cmd = ["git", "grep", "EXPORTED_SYMBOLS = \[", "*.js"]
+        cmd = ["git", "grep", r"EXPORTED_SYMBOLS = \[", "*.js"]
         for line in run(cmd):
             m = re.search("^([^:]+):", line)
             if not m:

testing/firefox-ui/harness/setup.py

@@ -18,7 +18,7 @@ def read(*parts):
 
 def get_version():
     return re.findall(
-        '__version__ = "([\d\.]+)"', read("firefox_ui_harness", "__init__.py"), re.M
+        r'__version__ = "([\d\.]+)"', read("firefox_ui_harness", "__init__.py"), re.M
     )[0]
 
 

testing/jsshell/benchmark.py

@@ -157,7 +157,7 @@ class Ares6(Benchmark):
         self.scores = defaultdict(lambda: defaultdict(list))
 
     def _try_find_score(self, score_name, line):
-        m = re.search(score_name + ":\s*(\d+\.?\d*?) (\+-)?.+", line)
+        m = re.search(score_name + r":\s*(\d+\.?\d*?) (\+-)?.+", line)
         if not m:
             return False
 
@@ -168,7 +168,7 @@ class Ares6(Benchmark):
     def process_line(self, proc, line):
         line = line.strip("\n")
         print(line)
-        m = re.search("Running... (.+) \(.+\)", line)
+        m = re.search(r"Running... (.+) \(.+\)", line)
         if m:
             self.bench_name = m.group(1)
             return
@@ -182,7 +182,7 @@ class Ares6(Benchmark):
         if self._try_find_score("steadyState", line):
             return
 
-        m = re.search("summary:\s*(\d+\.?\d*?) (\+-)?.+", line)
+        m = re.search(r"summary:\s*(\d+\.?\d*?) (\+-)?.+", line)
         if m:
             self.last_summary = float(m.group(1))
 
@@ -218,7 +218,7 @@ class SixSpeed(RunOnceBenchmark):
     def process_line(self, proc, output):
         output = output.strip("\n")
         print(output)
-        m = re.search("(.+): (\d+)", output)
+        m = re.search(r"(.+): (\d+)", output)
         if not m:
             return
         subtest = m.group(1)
@@ -250,7 +250,7 @@ class SunSpider(RunOnceBenchmark):
     def process_line(self, proc, output):
         output = output.strip("\n")
         print(output)
-        m = re.search("(.+): (\d+)", output)
+        m = re.search(r"(.+): (\d+)", output)
         if not m:
             return
         subtest = m.group(1)
@@ -339,7 +339,7 @@ class Octane(RunOnceBenchmark):
     def process_line(self, proc, output):
         output = output.strip("\n")
         print(output)
-        m = re.search("(.+): (\d+)", output)
+        m = re.search(r"(.+): (\d+)", output)
         if not m:
             return
         subtest = m.group(1)

testing/marionette/client/setup.py

@@ -17,7 +17,7 @@ def read(*parts):
 
 def get_version():
     return re.findall(
-        '__version__ = "([\d\.]+)"', read("marionette_driver", "__init__.py"), re.M
+        r'__version__ = "([\d\.]+)"', read("marionette_driver", "__init__.py"), re.M
     )[0]
 
 

testing/marionette/harness/marionette_harness/runner/base.py

@@ -730,7 +730,7 @@ class BaseMarionetteTestRunner(object):
     @property
     def filename_pattern(self):
         if self._filename_pattern is None:
-            self._filename_pattern = re.compile("^test(((_.+?)+?\.((py))))$")
+            self._filename_pattern = re.compile(r"^test(((_.+?)+?\.((py))))$")
 
         return self._filename_pattern
 

testing/marionette/harness/marionette_harness/tests/unit/test_pagesource.py

@@ -47,6 +47,6 @@ class TestPageSource(MarionetteTestCase):
         import re
 
         self.assertEqual(
-            re.sub("\s", "", source), "<xml><foo><bar>baz</bar></foo></xml>"
+            re.sub(r"\s", "", source), "<xml><foo><bar>baz</bar></foo></xml>"
         )
         self.assertEqual(source, from_web_api)

testing/marionette/harness/setup.py

@@ -17,7 +17,7 @@ def read(*parts):
 
 def get_version():
     return re.findall(
-        '__version__ = "([\d\.]+)"', read("marionette_harness", "__init__.py"), re.M
+        r'__version__ = "([\d\.]+)"', read("marionette_harness", "__init__.py"), re.M
     )[0]
 
 

testing/mochitest/leaks.py

@@ -8,8 +8,8 @@
 import re
 from operator import itemgetter
 
-RE_DOCSHELL = re.compile("I\/DocShellAndDOMWindowLeak ([+\-]{2})DOCSHELL")
+RE_DOCSHELL = re.compile(r"I\/DocShellAndDOMWindowLeak ([+\-]{2})DOCSHELL")
-RE_DOMWINDOW = re.compile("I\/DocShellAndDOMWindowLeak ([+\-]{2})DOMWINDOW")
+RE_DOMWINDOW = re.compile(r"I\/DocShellAndDOMWindowLeak ([+\-]{2})DOMWINDOW")
 
 
 class ShutdownLeaks(object):
@@ -233,7 +233,7 @@ class ShutdownLeaks(object):
                 self.hiddenDocShellsCount += 1
 
     def _parseValue(self, line, name):
-        match = re.search("\[%s = (.+?)\]" % name, line)
+        match = re.search(r"\[%s = (.+?)\]" % name, line)
         if match:
             return match.group(1)
         return None
@@ -329,17 +329,17 @@ class LSANLeaks(object):
         )
 
         self.startRegExp = re.compile(
-            "==\d+==ERROR: LeakSanitizer: detected memory leaks"
+            r"==\d+==ERROR: LeakSanitizer: detected memory leaks"
         )
         self.fatalErrorRegExp = re.compile(
-            "==\d+==LeakSanitizer has encountered a fatal error."
+            r"==\d+==LeakSanitizer has encountered a fatal error."
         )
         self.symbolizerOomRegExp = re.compile(
             "LLVMSymbolizer: error reading file: Cannot allocate memory"
         )
-        self.stackFrameRegExp = re.compile("    #\d+ 0x[0-9a-f]+ in ([^(</]+)")
+        self.stackFrameRegExp = re.compile(r"    #\d+ 0x[0-9a-f]+ in ([^(</]+)")
         self.sysLibStackFrameRegExp = re.compile(
-            "    #\d+ 0x[0-9a-f]+ \(([^+]+)\+0x[0-9a-f]+\)"
+            r"    #\d+ 0x[0-9a-f]+ \(([^+]+)\+0x[0-9a-f]+\)"
         )
 
     def log(self, line, path=""):

testing/mozbase/mozgeckoprofiler/mozgeckoprofiler/symbolicationRequest.py

@@ -11,7 +11,7 @@ LOG = get_proxy_logger("profiler")
 
 # Precompiled regex for validating lib names
 # Empty lib name means client couldn't associate frame with any lib
-gLibNameRE = re.compile("[0-9a-zA-Z_+\-\.]*$")
+gLibNameRE = re.compile(r"[0-9a-zA-Z_+\-\.]*$")
 
 # Maximum number of times a request can be forwarded to a different server
 # for symbolication. Also prevents loops.

testing/mozbase/mozgeckoprofiler/tests/test_view_gecko_profiler.py

@@ -85,7 +85,7 @@ class TestViewGeckoProfile(unittest.TestCase):
             "https://profiler.firefox.com/from-url/"
             "http%3A%2F%2F127.0.0.1%3A{PORT}%2Ffakeprofile.json"
         )
-        actual_url = re.sub("%3A\d+%2F", "%3A{PORT}%2F", self.firefox_profiler_url)
+        actual_url = re.sub(r"%3A\d+%2F", "%3A{PORT}%2F", self.firefox_profiler_url)
 
         self.assertEqual(
             actual_url,

testing/mozbase/mozhttpd/tests/filelisting.py

@@ -45,7 +45,7 @@ def test_filelist(httpd, docroot, path):
 
     filelist = os.listdir(docroot)
 
-    pattern = "\<[a-zA-Z0-9\-\_\.\=\"'\/\\\%\!\@\#\$\^\&\*\(\) :;]*\>"
+    pattern = r"""\<[a-zA-Z0-9\-\_\.\="'\/\\%\!\@\#\$\^\&\*\(\) :;]*\>"""
 
     for line in f.readlines():
         subbed_lined = re.sub(pattern, "", ensure_str(line).strip("\n"))

testing/mozbase/mozleak/mozleak/lsan.py

@@ -60,20 +60,20 @@ class LSANLeaks(object):
         )
 
         self.startRegExp = re.compile(
-            "==\d+==ERROR: LeakSanitizer: detected memory leaks"
+            r"==\d+==ERROR: LeakSanitizer: detected memory leaks"
         )
         self.fatalErrorRegExp = re.compile(
-            "==\d+==LeakSanitizer has encountered a fatal error."
+            r"==\d+==LeakSanitizer has encountered a fatal error."
         )
         self.symbolizerOomRegExp = re.compile(
             "LLVMSymbolizer: error reading file: Cannot allocate memory"
         )
-        self.stackFrameRegExp = re.compile("    #\d+ 0x[0-9a-f]+ in ([^(</]+)")
+        self.stackFrameRegExp = re.compile(r"    #\d+ 0x[0-9a-f]+ in ([^(</]+)")
         self.sysLibStackFrameRegExp = re.compile(
-            "    #\d+ 0x[0-9a-f]+ \(([^+]+)\+0x[0-9a-f]+\)"
+            r"    #\d+ 0x[0-9a-f]+ \(([^+]+)\+0x[0-9a-f]+\)"
         )
         self.summaryRegexp = re.compile(
-            "SUMMARY: AddressSanitizer: (\d+) byte\(s\) leaked in (\d+) allocation\(s\)."
+            r"SUMMARY: AddressSanitizer: (\d+) byte\(s\) leaked in (\d+) allocation\(s\)."
         )
         self.rustRegexp = re.compile("::h[a-f0-9]{16}$")
         self.setAllowed(allowed)

testing/mozbase/moznetwork/tests/test_moznetwork.py

@@ -21,8 +21,8 @@ def ip_addresses():
     # Regex to match IPv4 addresses.
     # 0-255.0-255.0-255.0-255, note order is important here.
     regexip = re.compile(
-        "((25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)\.){3}"
+        r"((25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)\.){3}"
-        "(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)"
+        r"(25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|\d)"
     )
 
     commands = (

testing/mozbase/mozrunner/mozrunner/devices/android_device.py

@@ -260,7 +260,7 @@ def _maybe_update_host_utils(build_obj):
 
     # Compare, prompt, update
     if existing_version and manifest_version:
-        hu_version_regex = "host-utils-([\d\.]*)"
+        hu_version_regex = r"host-utils-([\d\.]*)"
         manifest_version = float(re.search(hu_version_regex, manifest_version).group(1))
         existing_version = float(re.search(hu_version_regex, existing_version).group(1))
         if existing_version < manifest_version:

testing/mozharness/configs/marionette/windows_taskcluster_config.py

@@ -17,8 +17,8 @@ DESKTOP_VISUALFX_THEME = {
     "Custom": 3,
 }.get("Best appearance")
 TASKBAR_AUTOHIDE_REG_PATH = {
-    "Windows 7": "HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects2",
+    "Windows 7": r"HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects2",
-    "Windows 10": "HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects3",
+    "Windows 10": r"HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects3",
 }.get("{} {}".format(platform.system(), platform.release()))
 
 #####
@@ -99,7 +99,7 @@ config = {
             "cmd": [
                 "powershell",
                 "-command",
-                "\"&{{&Set-ItemProperty -Path 'HKCU:Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects' -Name VisualFXSetting -Value {}}}\"".format(
+                "\"&{{&Set-ItemProperty -Path 'HKCU:Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\VisualEffects' -Name VisualFXSetting -Value {}}}\"".format(
                     DESKTOP_VISUALFX_THEME
                 ),
             ],
@@ -112,7 +112,7 @@ config = {
             "cmd": [
                 "powershell",
                 "-command",
-                "New-ItemProperty -Path 'HKCU:\Control Panel\Accessibility' -Name 'DynamicScrollbars' -Value 0",
+                r"New-ItemProperty -Path 'HKCU:\Control Panel\Accessibility' -Name 'DynamicScrollbars' -Value 0",
             ],
             "architectures": ["32bit", "64bit"],
             "halt_on_failure": False,

testing/mozharness/configs/web_platform_tests/prod_config_windows_taskcluster.py

@@ -20,8 +20,8 @@ DESKTOP_VISUALFX_THEME = {
     "Custom": 3,
 }.get("Best appearance")
 TASKBAR_AUTOHIDE_REG_PATH = {
-    "Windows 7": "HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects2",
+    "Windows 7": r"HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects2",
-    "Windows 10": "HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects3",
+    "Windows 10": r"HKCU:SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\StuckRects3",
 }.get("{} {}".format(platform.system(), platform.release()))
 #####
 
@@ -85,7 +85,7 @@ config = {
             "cmd": [
                 "powershell",
                 "-command",
-                "\"&{{&Set-ItemProperty -Path 'HKCU:Software\Microsoft\Windows\CurrentVersion\Explorer\VisualEffects' -Name VisualFXSetting -Value {}}}\"".format(
+                "\"&{{&Set-ItemProperty -Path 'HKCU:Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\VisualEffects' -Name VisualFXSetting -Value {}}}\"".format(
                     DESKTOP_VISUALFX_THEME
                 ),
             ],
@@ -98,7 +98,7 @@ config = {
             "cmd": [
                 "powershell",
                 "-command",
-                "New-ItemProperty -Path 'HKCU:\Control Panel\Accessibility' -Name 'DynamicScrollbars' -Value 0",
+                r"New-ItemProperty -Path 'HKCU:\Control Panel\Accessibility' -Name 'DynamicScrollbars' -Value 0",
             ],
             "architectures": ["32bit", "64bit"],
             "halt_on_failure": False,

testing/mozharness/examples/action_config_script.py

@@ -94,7 +94,7 @@ class ActionsConfigExample(BaseScript):
 
     def _ship1(self):
         self.info(
-            """
+            r"""
      _~
   _~ )_)_~
   )_))_))_)
@@ -106,7 +106,7 @@ class ActionsConfigExample(BaseScript):
 
     def _ship2(self):
         self.info(
-            """
+            r"""
     _4 _4
    _)_))_)
   _)_)_)_)

testing/mozharness/external_tools/robustcheckout.py

@@ -407,7 +407,7 @@ def _docheckout(
             ui.warn(b"(shared store does not exist; deleting destination)\n")
             with timeit("removed_missing_shared_store", "remove-wdir"):
                 destvfs.rmtree(forcibly=True)
-        elif not re.search(b"[a-f0-9]{40}/\.hg$", storepath.replace(b"\\", b"/")):
+        elif not re.search(rb"[a-f0-9]{40}/\.hg$", storepath.replace(b"\\", b"/")):
             ui.warn(
                 b"(shared store does not belong to pooled storage; "
                 b"deleting destination to improve efficiency)\n"

testing/mozharness/mozharness/mozilla/firefox/autoconfig.py

@@ -56,7 +56,7 @@ def _autoconfig_path(fx_install_dir):
 
 
 def _cfg_file_path(fx_install_dir):
-    """
+    r"""
     Windows:        defaults\pref
     Mac:            Firefox.app/Contents/Resources/defaults/pref
     Linux:          defaults/pref

testing/mozharness/scripts/openh264_build.py

@@ -363,7 +363,7 @@ class OpenH264Build(TransferMixin, VCSScript, TooltoolMixin):
         to_package = []
         for f in glob.glob(os.path.join(srcdir, "*gmpopenh264*")):
             if not re.search(
-                "(?:lib)?gmpopenh264(?!\.\d)\.(?:dylib|so|dll|info)(?!\.\d)", f
+                r"(?:lib)?gmpopenh264(?!\.\d)\.(?:dylib|so|dll|info)(?!\.\d)", f
             ):
                 # Don't package unnecessary zip bloat
                 # Blocks things like libgmpopenh264.2.dylib and libgmpopenh264.so.1

testing/talos/talos/allowlist.py

@@ -85,7 +85,7 @@ class Allowlist:
                 if len(parts) >= 2:
                     filename = "%s%s" % (parts[0], new_name)
 
-        return filename.strip("/\\\ \t")
+        return filename.strip("/\\\\ \t")
 
     def check(self, test, file_name_index, event_source_index=None):
         errors = {}

testing/talos/talos/results.py

@@ -311,7 +311,7 @@ class BrowserLogResults(object):
 
     # regular expression for responsiveness results
     RESULTS_RESPONSIVENESS_REGEX = re.compile(
-        "MOZ_EVENT_TRACE\ssample\s\d*?\s(\d*\.?\d*)$", re.DOTALL | re.MULTILINE
+        r"MOZ_EVENT_TRACE\ssample\s\d*?\s(\d*\.?\d*)$", re.DOTALL | re.MULTILINE
     )
 
     # classes for results types

testing/talos/talos/xtalos/etlparser.py

@@ -221,7 +221,7 @@ def trackProcess(row, firstFirefoxPID):
     parentPID = int(row[PARENT_PID_INDEX])
     if parentPID == firstFirefoxPID:
         proc = row[PROCESS_INDEX]
-        gBrowserPID = int(re.search("^.* \(\s*(\d+)\)$", proc).group(1))
+        gBrowserPID = int(re.search(r"^.* \(\s*(\d+)\)$", proc).group(1))
 
 
 def getBrowserPID():
@@ -232,7 +232,7 @@ def getBrowserPID():
 def trackThread(row, browserPID):
     event, proc, tid = row[EVENTNAME_INDEX], row[PROCESS_INDEX], row[THREAD_ID_INDEX]
     if event in ["T-DCStart", "T-Start"]:
-        procName, procID = re.search("^(.*) \(\s*(\d+)\)$", proc).group(1, 2)
+        procName, procID = re.search(r"^(.*) \(\s*(\d+)\)$", proc).group(1, 2)
         if procID == str(browserPID):
             imgIdx = getIndex(event, IMAGEFUNC_COL)
             img = re.match("([^!]+)!", row[imgIdx]).group(1)
@@ -267,7 +267,7 @@ def trackThreadNetIO(row, io, stage):
         gConnectionIDs[connID] = tid
     origThread = gConnectionIDs[connID]
     if origThread in gThreads:
-        match = re.match("[\w-]+\/([\w-]+)?", event)
+        match = re.match(r"[\w-]+\/([\w-]+)?", event)
         if not match:
             raise xtalos.XTalosError(
                 "Could not find a regular expression match for event: {}".format(event)

testing/talos/talos/xtalos/xperf_analyzer.py

@@ -671,7 +671,7 @@ class SessionStoreWindowRestored(ClassicEvent):
 class ProcessStart(XPerfEvent):
     cmd_line_index = None
     process_index = None
-    extractor = re.compile("^(.+) \(\s*(\d+)\)$")
+    extractor = re.compile(r"^(.+) \(\s*(\d+)\)$")
 
     def __init__(self, leafname):
         super(ProcessStart, self).__init__("P-Start")
@@ -746,7 +746,7 @@ class ThreadStart(XPerfEvent):
 
     process_index = None
     tid_index = None
-    pid_extractor = re.compile("^.+ \(\s*(\d+)\)$")
+    pid_extractor = re.compile(r"^.+ \(\s*(\d+)\)$")
 
     def __init__(self):
         super(ThreadStart, self).__init__("T-Start")

testing/tps/tps/cli.py

@@ -125,7 +125,7 @@ def main():
     else:
         if sys.platform == "win32":
             # replace msys-style paths with proper Windows paths
-            m = re.match("^\/\w\/", extensionDir)
+            m = re.match(r"^\/\w\/", extensionDir)
             if m:
                 extensionDir = "%s:/%s" % (m.group(0)[1:2], extensionDir[3:])
                 extensionDir = extensionDir.replace("/", "\\")

testing/web-platform/metasummary.py

@@ -378,8 +378,8 @@ def add_test_data(logger, wpt_meta, dir_path, test, subtest, test_data):
                     meta.set(test, subtest, product="firefox", bug_url=bug_link)
 
 
-bugzilla_re = re.compile("https://bugzilla\.mozilla\.org/show_bug\.cgi\?id=\d+")
+bugzilla_re = re.compile(r"https://bugzilla\.mozilla\.org/show_bug\.cgi\?id=\d+")
-bug_re = re.compile("(?:[Bb][Uu][Gg])?\s*(\d+)")
+bug_re = re.compile(r"(?:[Bb][Uu][Gg])?\s*(\d+)")
 
 
 def get_bug_link(value):

testing/web-platform/mozilla/tests/webdriver/support/fixtures.py

@@ -234,7 +234,7 @@ class Browser:
 
 
 class Geckodriver:
-    PORT_RE = re.compile(b".*Listening on [^ :]*:(\d+)")
+    PORT_RE = re.compile(rb".*Listening on [^ :]*:(\d+)")
 
     def __init__(self, configuration, hostname=None, extra_args=None):
         self.config = configuration["webdriver"]

testing/web-platform/tests/annotation-model/tools/make_tests.py

@@ -38,7 +38,7 @@ for curdir, subdirList, fileList in os.walk(DEFDIR, topdown=True):
     except ValueError as e:
       print("parse of " + theFile + " failed: " + e[0])
     else:
-      theFile = re.sub("\.\./", "", theFile)
+      theFile = re.sub(r"\.\./", "", theFile)
       defList.append(theFile)
 
 if (len(defList)):
@@ -75,7 +75,7 @@ for curdir, subdirList, fileList in os.walk(TESTTREE, topdown=True):
         templateFile = autoTemplate
         suffix = ".html"
 
-      rfile = re.sub("\.\./", "", file)
+      rfile = re.sub(r"\.\./", "", file)
       # interesting pattern is {{TESTFILE}}
       tcopy = re.sub("{{TESTFILE}}", rfile, templateFile)
 
@@ -88,7 +88,7 @@ for curdir, subdirList, fileList in os.walk(TESTTREE, topdown=True):
       tcopy = re.sub("{{TESTTITLE}}", title, tcopy)
 
       # target file is basename of theFile + '-manual.html'
-      target = re.sub("\.test",suffix, theFile)
+      target = re.sub(r"\.test",suffix, theFile)
 
       try:
         out = open(target, "w")

testing/web-platform/tests/html/syntax/speculative-parsing/tools/generate.py

@@ -680,7 +680,7 @@ def generate_tests(testcase, tentative):
 
     html_testcase_markup = template_testcase_markup.format(url_wptserve_sub)
     html_nonspeculative_testcase_markup = template_nonspeculative_testcase_markup.format(url_wptserve_sub)
-    js_testcase_markup = template_testcase_markup.format(url_js_sub).replace(u"</script>", u"<\/script>").replace(u"<meta charset", u"<meta\ charset")
+    js_testcase_markup = template_testcase_markup.format(url_js_sub).replace(u"</script>", u"<\\/script>").replace(u"<meta charset", u"<meta\\ charset")
 
     if test_nonspeculative == u'true':
         nonspeculative = template_nonspeculative.format(preamble=preamble, encoding_decl=encoding_decl, title=title, nonspeculative_testcase_markup=html_nonspeculative_testcase_markup, delay=delay)

testing/web-platform/unittestrunner.py

@@ -51,7 +51,7 @@ class ReplaceRequirements(object):
         with open(path) as f:
             parser.read_file(f)
         deps = parser.get("testenv", "deps")
-        dep_re = re.compile("(?:.*:\s*)?-r(.*)")
+        dep_re = re.compile(r"(?:.*:\s*)?-r(.*)")
 
         # This can break if we start using more features of tox
         for dep in deps.splitlines():

testing/web-platform/update/tree.py

@@ -157,13 +157,13 @@ class GeckoCommitMessage(CommitMessage):
     # than just enforce a general pattern.
 
     _bug_re = re.compile(
-        "^Bug (\d+)[^\w]*(?:Part \d+[^\w]*)?(.*?)\s*(?:r=(\w*))?$", re.IGNORECASE
+        r"^Bug (\d+)[^\w]*(?:Part \d+[^\w]*)?(.*?)\s*(?:r=(\w*))?$", re.IGNORECASE
     )
 
     _backout_re = re.compile(
-        "^(?:Back(?:ing|ed)\s+out)|Backout|(?:Revert|(?:ed|ing))", re.IGNORECASE
+        r"^(?:Back(?:ing|ed)\s+out)|Backout|(?:Revert|(?:ed|ing))", re.IGNORECASE
     )
-    _backout_sha1_re = re.compile("(?:\s|\:)(0-9a-f){12}")
+    _backout_sha1_re = re.compile(r"(?:\s|\:)(0-9a-f){12}")
 
     def _parse_message(self):
         CommitMessage._parse_message(self)

testing/web-platform/update/upstream.py

@@ -174,7 +174,7 @@ class LoadCommits(Step):
         )
 
         update_regexp = re.compile(
-            "Bug \d+ - Update web-platform-tests to revision [0-9a-f]{40}"
+            r"Bug \d+ - Update web-platform-tests to revision [0-9a-f]{40}"
         )
 
         state.has_backouts = False

testing/webcompat/fixtures.py

@@ -125,7 +125,7 @@ def config_file(request):
 
 @pytest.fixture
 def bug_number(request):
-    return re.findall("\d+", str(request.fspath.basename))[0]
+    return re.findall(r"\d+", str(request.fspath.basename))[0]
 
 
 @pytest.fixture

testing/xpcshell/selftest.py

@@ -112,7 +112,7 @@ add_test(function test_loop () {
 });
 """
 
-PASSING_TEST_UNICODE = b"""
+PASSING_TEST_UNICODE = rb"""
 function run_test () { run_next_test(); }
 
 add_test(function test_unicode_print () {
@@ -659,8 +659,8 @@ prefs = [
 
         self.assertInLog("###!!! ASSERTION")
         log_lines = self.log.getvalue().splitlines()
-        line_pat = "#\d\d:"
+        line_pat = r"#\d\d:"
-        unknown_pat = "#\d\d\: \?\?\?\[.* \+0x[a-f0-9]+\]"
+        unknown_pat = r"#\d\d\: \?\?\?\[.* \+0x[a-f0-9]+\]"
         self.assertFalse(
             any(re.search(unknown_pat, line) for line in log_lines),
             "An stack frame without symbols was found in\n%s"

toolkit/crashreporter/tools/symbolstore.py

@@ -578,7 +578,7 @@ class Dumper:
                 # MODULE os cpu guid debug_file
                 (guid, debug_file) = (module_line.split())[3:5]
                 # strip off .pdb extensions, and append .sym
-                sym_file = re.sub("\.pdb$", "", debug_file) + ".sym"
+                sym_file = re.sub(r"\.pdb$", "", debug_file) + ".sym"
                 # we do want forward slashes here
                 rel_path = os.path.join(debug_file, guid, sym_file).replace("\\", "/")
                 full_path = os.path.normpath(os.path.join(self.symbol_path, rel_path))

tools/lint/cpp/mingw-capitalization.py

@@ -18,7 +18,7 @@ class MinGWCapitalization(LineType):
         super(MinGWCapitalization, self).__init__(*args, **kwargs)
         with open(HEADERS_FILE, "r") as fh:
             self.headers = fh.read().strip().splitlines()
-        self.regex = re.compile("^#include\s*<(" + "|".join(self.headers) + ")>")
+        self.regex = re.compile(r"^#include\s*<(" + "|".join(self.headers) + ")>")
 
     def condition(self, payload, line, config):
         if not line.startswith("#include"):

tools/lint/perfdocs/framework_gatherers.py

@@ -265,8 +265,8 @@ class RaptorGatherer(FrameworkGatherer):
                 sub_title = key.replace("_", " ")
                 if key == "test_url":
                     if "<" in description[key] or ">" in description[key]:
-                        description[key] = description[key].replace("<", "\<")
+                        description[key] = description[key].replace("<", r"\<")
-                        description[key] = description[key].replace(">", "\>")
+                        description[key] = description[key].replace(">", r"\>")
                     result += f"   * **{sub_title}**: `<{description[key]}>`__\n"
                 elif key == "secondary_url":
                     result += f"   * **{sub_title}**: `<{description[key]}>`__\n"

tools/lint/perfdocs/verifier.py

@@ -101,7 +101,7 @@ class Verifier(object):
     ):
         """Determine if a target name (from a YAML) matches with a test."""
         tb = os.path.basename(target_test_name)
-        tb = re.sub("\..*", "", tb)
+        tb = re.sub(r"\..*", "", tb)
         if test_name == tb:
             # Found an exact match for the test_name
             return True
@@ -169,7 +169,7 @@ class Verifier(object):
         for test_name, test_info in test_list.items():
             manifest_path = test_info.get("path", test_info.get("manifest", ""))
             tb = os.path.basename(manifest_path)
-            tb = re.sub("\..*", "", tb)
+            tb = re.sub(r"\..*", "", tb)
             if (
                 stests.get(tb, None) is not None
                 or stests.get(test_name, None) is not None

tools/lint/yamllint_/__init__.py

@@ -15,7 +15,9 @@ from mozlint import result
 from mozlint.pathutils import get_ancestors_by_name
 from mozlint.util.implementation import LintProcess
 
-YAMLLINT_FORMAT_REGEX = re.compile("(.*):(.*):(.*): \[(error|warning)\] (.*) \((.*)\)$")
+YAMLLINT_FORMAT_REGEX = re.compile(
+    r"(.*):(.*):(.*): \[(error|warning)\] (.*) \((.*)\)$"
+)
 
 results = []
 

tools/rb/fix_stacks.py

@@ -16,7 +16,7 @@ from subprocess import PIPE, Popen
 
 # Matches lines produced by MozFormatCodeAddress(), e.g.
 # `#01: ???[tests/example +0x43a0]`.
-line_re = re.compile("#\d+: .+\[.+ \+0x[0-9A-Fa-f]+\]")
+line_re = re.compile(r"#\d+: .+\[.+ \+0x[0-9A-Fa-f]+\]")
 
 fix_stacks = None