use raw strings for regex to fix backslash interpretation

ifupdown2/addons/bridge.py

@@ -3991,7 +3991,7 @@ def _query_check_l2protocol_tunnel(self, brport_name, user_config_l2protocol_tun
         cached_ifla_brport_group_maskhi = self.cache.get_link_info_slave_data_attribute(brport_name, Link.IFLA_BRPORT_GROUP_FWD_MASKHI)
         cached_ifla_brport_group_mask = self.cache.get_link_info_slave_data_attribute(brport_name, Link.IFLA_BRPORT_GROUP_FWD_MASK)
 
-        for protocol in re.split(',|\s*', user_config_l2protocol_tunnel):
+        for protocol in re.split(r',|\s*', user_config_l2protocol_tunnel):
             callback = self.query_check_l2protocol_tunnel_callback.get(protocol)
 
             if callable(callback):

ifupdown2/ifupdown/ifupdownmain.py

@@ -1575,7 +1575,7 @@ def _sched_ifaces(self, ifacenames, ops, skipupperifaces=False,
 
     def _render_ifacename(self, ifacename):
         new_ifacenames = []
-        vlan_match = re.match("^([\d]+)-([\d]+)", ifacename)
+        vlan_match = re.match(r"^([\d]+)-([\d]+)", ifacename)
         if vlan_match:
             vlan_groups = vlan_match.groups()
             if vlan_groups[0] and vlan_groups[1]:

ifupdown2/ifupdown/utils.py

@@ -236,7 +236,7 @@ def parse_iface_range(cls, name):
         # eg: swp1.[2-100]
         # return (prefix, range-start, range-end)
         # eg return ("swp1.", 1, 20, ".100")
-        range_match = re.match("^([\w]+)\[([\d]+)-([\d]+)\]([\.\w]+)", name)
+        range_match = re.match(r"^([\w]+)\[([\d]+)-([\d]+)\]([\.\w]+)", name)
         if range_match:
             range_groups = range_match.groups()
             if range_groups[1] and range_groups[2]:
@@ -246,7 +246,7 @@ def parse_iface_range(cls, name):
             # eg: swp[1-20].100
             # return (prefix, range-start, range-end, suffix)
             # eg return ("swp", 1, 20, ".100")
-            range_match = re.match("^([\w\.]+)\[([\d]+)-([\d]+)\]", name)
+            range_match = re.match(r"^([\w\.]+)\[([\d]+)-([\d]+)\]", name)
             if range_match:
                 range_groups = range_match.groups()
                 if range_groups[1] and range_groups[2]:

ifupdown2/lib/iproute2.py

@@ -62,7 +62,7 @@
 class IPRoute2(Cache, Requirements):
 
     VXLAN_UDP_PORT = 4789
-    VXLAN_PEER_REGEX_PATTERN = re.compile("\s+dst\s+(\d+.\d+.\d+.\d+)\s+")
+    VXLAN_PEER_REGEX_PATTERN = re.compile(r"\s+dst\s+(\d+.\d+.\d+.\d+)\s+")
 
     def __init__(self):
         Cache.__init__(self)