diff --git a/ppadb/command/transport/__init__.py b/ppadb/command/transport/__init__.py
index 1adadf6..768094a 100644
--- a/ppadb/command/transport/__init__.py
+++ b/ppadb/command/transport/__init__.py
@@ -92,7 +92,7 @@ def list_packages(self):
 
     def get_properties(self):
         result = self.shell("getprop")
-        result_pattern = "^\[([\s\S]*?)\]: \[([\s\S]*?)\]\r?$"
+        result_pattern = r"^\[([\s\S]*?)\]: \[([\s\S]*?)\]\r?$"
 
         properties = {}
         for line in result.split('\n'):
diff --git a/ppadb/device.py b/ppadb/device.py
index dd08ec4..ffcb32b 100644
--- a/ppadb/device.py
+++ b/ppadb/device.py
@@ -31,7 +31,7 @@
 
 
 class Device(Transport, Serial, Input, Utils, WM, Traffic, CPUStat, BatteryStats):
-    INSTALL_RESULT_PATTERN = "(Success|Failure|Error)\s?(.*)"
+    INSTALL_RESULT_PATTERN = r"(Success|Failure|Error)\s?(.*)"
     UNINSTALL_RESULT_PATTERN = "(Success|Failure.*|.*Unknown package:.*)"
 
     def __init__(self, client, serial):
diff --git a/ppadb/device_async.py b/ppadb/device_async.py
index 5e4a8b0..abcae88 100644
--- a/ppadb/device_async.py
+++ b/ppadb/device_async.py
@@ -21,7 +21,7 @@ def _get_src_info(src):
 
 
 class DeviceAsync(TransportAsync):
-    INSTALL_RESULT_PATTERN = "(Success|Failure|Error)\s?(.*)"
+    INSTALL_RESULT_PATTERN = r"(Success|Failure|Error)\s?(.*)"
     UNINSTALL_RESULT_PATTERN = "(Success|Failure.*|.*Unknown package:.*)"
 
     def __init__(self, client, serial):
diff --git a/ppadb/plugins/device/cpustat.py b/ppadb/plugins/device/cpustat.py
index 1175f3d..9dd38e1 100644
--- a/ppadb/plugins/device/cpustat.py
+++ b/ppadb/plugins/device/cpustat.py
@@ -87,7 +87,7 @@ def total(self):
 
 class CPUStat(Plugin):
     total_cpu_pattern = re.compile(
-        "cpu\s+([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s")
+        r"cpu\s+([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s([\d]+)\s")
 
     def cpu_times(self):
         return self.get_total_cpu()
diff --git a/ppadb/plugins/device/traffic.py b/ppadb/plugins/device/traffic.py
index 0e1a66a..e44fbe9 100644
--- a/ppadb/plugins/device/traffic.py
+++ b/ppadb/plugins/device/traffic.py
@@ -33,7 +33,7 @@ def get_traffic(self, package_name):
         cmd = 'dumpsys package {} | grep userId'.format(package_name)
         result = self.shell(cmd).strip()
 
-        pattern = "userId=([\d]+)"
+        pattern = r"userId=([\d]+)"
 
         if result:
             match = re.search(pattern, result)
diff --git a/ppadb/plugins/device/utils.py b/ppadb/plugins/device/utils.py
index 225674d..99872ee 100644
--- a/ppadb/plugins/device/utils.py
+++ b/ppadb/plugins/device/utils.py
@@ -32,7 +32,7 @@ def get_top_activity(self):
             return None
 
     def get_top_activities(self):
-        pattern = "ACTIVITY\s([\w\.]+)/([\w\.]+)\s[\w\d]+\spid=([\d]+)"
+        pattern = r"ACTIVITY\s([\w\.]+)/([\w\.]+)\s[\w\d]+\spid=([\d]+)"
         cmd = "dumpsys activity top | grep ACTIVITY"
         result = self.shell(cmd)
 
@@ -45,13 +45,13 @@ def get_top_activities(self):
         return activities
 
     def get_meminfo(self, package_name):
-        total_meminfo_re = re.compile('\s*TOTAL\s*(?P<pss>\d+)'
-                                      '\s*(?P<private_dirty>\d+)'
-                                      '\s*(?P<private_clean>\d+)'
-                                      '\s*(?P<swapped_dirty>\d+)'
-                                      '\s*(?P<heap_size>\d+)'
-                                      '\s*(?P<heap_alloc>\d+)'
-                                      '\s*(?P<heap_free>\d+)')
+        total_meminfo_re = re.compile(r'\s*TOTAL\s*(?P<pss>\d+)'
+                                      r'\s*(?P<private_dirty>\d+)'
+                                      r'\s*(?P<private_clean>\d+)'
+                                      r'\s*(?P<swapped_dirty>\d+)'
+                                      r'\s*(?P<heap_size>\d+)'
+                                      r'\s*(?P<heap_alloc>\d+)'
+                                      r'\s*(?P<heap_free>\d+)')
 
         cmd = 'dumpsys meminfo {}'.format(package_name)
         result = self.shell(cmd)
@@ -82,7 +82,7 @@ def get_uid(self, package_name):
         cmd = 'dumpsys package {} | grep userId'.format(package_name)
         result = self.shell(cmd).strip()
 
-        pattern = "userId=([\d]+)"
+        pattern = r"userId=([\d]+)"
 
         if result:
             match = re.search(pattern, result)
@@ -99,7 +99,7 @@ def get_package_version_name(self, package_name):
         cmd = 'dumpsys package {} | grep versionName'.format(package_name)
         result = self.shell(cmd).strip()
 
-        pattern = "versionName=([\d\.]+)"
+        pattern = r"versionName=([\d\.]+)"
 
         if result:
             match = re.search(pattern, result)
diff --git a/ppadb/plugins/device/wm.py b/ppadb/plugins/device/wm.py
index 7a3c520..6d88823 100644
--- a/ppadb/plugins/device/wm.py
+++ b/ppadb/plugins/device/wm.py
@@ -9,7 +9,7 @@
 ])
 
 class WM(Plugin):
-    SIZE_RE = 'Physical size:\s([\d]+)x([\d]+)'
+    SIZE_RE = r'Physical size:\s([\d]+)x([\d]+)'
     def wm_size(self):
         result = self.shell("wm size")
         match = re.search(self.SIZE_RE, result)