diff --git a/os_brick/initiator/__init__.py b/os_brick/initiator/__init__.py
index d93e5ec18..019219220 100644
--- a/os_brick/initiator/__init__.py
+++ b/os_brick/initiator/__init__.py
@@ -24,8 +24,8 @@ import re
 
 
 DEVICE_SCAN_ATTEMPTS_DEFAULT = 3
-MULTIPATH_ERROR_REGEX = re.compile("\w{3} \d+ \d\d:\d\d:\d\d \|.*$")
-MULTIPATH_PATH_CHECK_REGEX = re.compile("\s+\d+:\d+:\d+:\d+\s+")
+MULTIPATH_ERROR_REGEX = re.compile(r"\w{3} \d+ \d\d:\d\d:\d\d \|.*$")
+MULTIPATH_PATH_CHECK_REGEX = re.compile(r"\s+\d+:\d+:\d+:\d+\s+")
 
 PLATFORM_ALL = 'ALL'
 PLATFORM_x86 = 'X86'
diff --git a/os_brick/initiator/linuxscsi.py b/os_brick/initiator/linuxscsi.py
index baa1f6e12..891088f57 100644
--- a/os_brick/initiator/linuxscsi.py
+++ b/os_brick/initiator/linuxscsi.py
@@ -32,8 +32,8 @@ from os_brick import utils
 
 LOG = logging.getLogger(__name__)
 
-MULTIPATH_ERROR_REGEX = re.compile("\w{3} \d+ \d\d:\d\d:\d\d \|.*$")
-MULTIPATH_WWID_REGEX = re.compile("\((?P<wwid>.+)\)")
+MULTIPATH_ERROR_REGEX = re.compile(r"\w{3} \d+ \d\d:\d\d:\d\d \|.*$")
+MULTIPATH_WWID_REGEX = re.compile(r"\((?P<wwid>.+)\)")
 MULTIPATH_DEVICE_ACTIONS = ['unchanged:', 'reject:', 'reload:',
                             'switchpg:', 'rename:', 'create:',
                             'resize:']
diff --git a/os_brick/remotefs/remotefs.py b/os_brick/remotefs/remotefs.py
index 0fa6538d9..3d036fa72 100644
--- a/os_brick/remotefs/remotefs.py
+++ b/os_brick/remotefs/remotefs.py
@@ -158,7 +158,7 @@ class RemoteFsClient(executor.Executor):
     def _check_nfs_options(self):
         """Checks and prepares nfs mount type options."""
         self._nfs_mount_type_opts = {'nfs': self._mount_options}
-        nfs_vers_opt_patterns = ['^nfsvers', '^vers', '^v[\d]']
+        nfs_vers_opt_patterns = ['^nfsvers', '^vers', r'^v[\d]']
         for opt in nfs_vers_opt_patterns:
             if self._option_exists(self._mount_options, opt):
                 return
@@ -246,7 +246,7 @@ class VZStorageRemoteFSClient(RemoteFsClient):
 
     def _do_mount(self, mount_type, vz_share, mount_path,
                   mount_options=None, flags=None):
-        m = re.search("(?:(\S+):\/)?([a-zA-Z0-9_-]+)(?::(\S+))?", vz_share)
+        m = re.search(r"(?:(\S+):\/)?([a-zA-Z0-9_-]+)(?::(\S+))?", vz_share)
         if not m:
             msg = (_("Invalid Virtuozzo Storage share specification: %r."
                      "Must be: [MDS1[,MDS2],...:/]<CLUSTER NAME>[:PASSWORD].")