diff --git a/ui/opensnitch/desktop_parser.py b/ui/opensnitch/desktop_parser.py
index 386c37dcb2..65e40887e0 100644
--- a/ui/opensnitch/desktop_parser.py
+++ b/ui/opensnitch/desktop_parser.py
@@ -49,7 +49,7 @@ def get_locale(self):
 
     def _parse_exec(self, cmd):
         try:
-            is_flatpak = re.search(r"^/usr/[s]*bin/flatpak.*--command=([a-zA-Z0-9-_\/\.\+]+)", cmd)
+            is_flatpak = re.search(r'^/usr/[s]*bin/flatpak.*--command=([a-zA-Z0-9-_\/\.\+]+)', cmd)
             if is_flatpak:
                 return is_flatpak.group(1)
 
diff --git a/ui/opensnitch/dialogs/prompt.py b/ui/opensnitch/dialogs/prompt.py
index 1345a4543a..b1825795cd 100644
--- a/ui/opensnitch/dialogs/prompt.py
+++ b/ui/opensnitch/dialogs/prompt.py
@@ -567,7 +567,7 @@ def _get_combo_operator(self, combo, what_idx):
             text = parts[len(parts)-1]
             # ^(|.*\.)yahoo\.com
             dsthost = r'\.'.join(text.split('.')).replace("*", "")
-            dsthost = r"^(|.*\.)%s" % dsthost[2:]
+            dsthost = r'^(|.*\.)%s' % dsthost[2:]
             return Config.RULE_TYPE_REGEXP, Config.OPERAND_DEST_HOST, dsthost
 
         elif combo.itemData(what_idx) == self.FIELD_REGEX_IP:
diff --git a/ui/opensnitch/dialogs/ruleseditor.py b/ui/opensnitch/dialogs/ruleseditor.py
index 9db402f73c..c16ab2307a 100644
--- a/ui/opensnitch/dialogs/ruleseditor.py
+++ b/ui/opensnitch/dialogs/ruleseditor.py
@@ -24,11 +24,11 @@
 class RulesEditorDialog(QtWidgets.QDialog, uic.loadUiType(DIALOG_UI_PATH)[0]):
 
     LOG_TAG = "[rules editor]"
-    classA_net = r"10\.\d{1,3}\.\d{1,3}\.\d{1,3}"
-    classB_net = r"172\.1[6-9]\.\d+\.\d+|172\.2[0-9]\.\d+\.\d+|172\.3[0-1]+\.\d{1,3}\.\d{1,3}"
-    classC_net = r"192\.168\.\d{1,3}\.\d{1,3}"
-    others_net = r"127\.\d{1,3}\.\d{1,3}\.\d{1,3}|169\.254\.\d{1,3}\.\d{1,3}"
-    multinets = r"2[32][23459]\.\d{1,3}\.\d{1,3}\.\d{1,3}"
+    classA_net = r'10\.\d{1,3}\.\d{1,3}\.\d{1,3}'
+    classB_net = r'172\.1[6-9]\.\d+\.\d+|172\.2[0-9]\.\d+\.\d+|172\.3[0-1]+\.\d{1,3}\.\d{1,3}'
+    classC_net = r'192\.168\.\d{1,3}\.\d{1,3}'
+    others_net = r'127\.\d{1,3}\.\d{1,3}\.\d{1,3}|169\.254\.\d{1,3}\.\d{1,3}'
+    multinets = r'2[32][23459]\.\d{1,3}\.\d{1,3}\.\d{1,3}'
     MULTICAST_RANGE = "^(" + multinets + ")$"
     LAN_RANGES = "^(" + others_net + "|" + classC_net + "|" + classB_net + "|" + classA_net + "|::1|f[cde].*::.*)$"
     LAN_LABEL = "LAN"
diff --git a/ui/opensnitch/utils/__init__.py b/ui/opensnitch/utils/__init__.py
index a684c7780e..736c4dd94d 100644
--- a/ui/opensnitch/utils/__init__.py
+++ b/ui/opensnitch/utils/__init__.py
@@ -401,7 +401,7 @@ def __init__(self):
             for line in etcServices:
                 if line[0] == "#":
                     continue
-                g = re.search(r"([a-zA-Z0-9\-]+)( |\t)+([0-9]+)\/([a-zA-Z0-9\-]+)(.*)\n", line)
+                g = re.search(r'([a-zA-Z0-9\-]+)( |\t)+([0-9]+)\/([a-zA-Z0-9\-]+)(.*)\n', line)
                 if g:
                     self.srv_array.append("{0}/{1} {2}".format(
                         g.group(1),