diff --git a/zenmap/zenmapCore/SearchResult.py b/zenmap/zenmapCore/SearchResult.py
index 86dd70dde..b335a4807 100644
--- a/zenmap/zenmapCore/SearchResult.py
+++ b/zenmap/zenmapCore/SearchResult.py
@@ -143,7 +143,7 @@ class HostSearch(object):
     @staticmethod
     def match_port(host_ports, port, port_state):
         # Check if the port is parsable, if not return False silently
-        if re.match("^\d+$", port) is None:
+        if re.match(r"^\d+$", port) is None:
             return False
 
         for hp in host_ports:
@@ -258,10 +258,10 @@ class SearchResult(object):
             fuzz = date_arg.count("~")
             date_arg = date_arg.replace("~", "")
 
-        if re.match("\d\d\d\d-\d\d-\d\d$", date_arg) is not None:
+        if re.match(r"\d\d\d\d-\d\d-\d\d$", date_arg) is not None:
             year, month, day = date_arg.split("-")
             parsed_date = date(int(year), int(month), int(day))
-        elif re.match("[-|\+]\d+$", date_arg):
+        elif re.match(r"[-|\+]\d+$", date_arg):
             # We need to convert from the "-n" format (n days ago) to a date
             # object (I found this in some old code, don't ask :) )
             parsed_date = date.fromordinal(
@@ -321,7 +321,7 @@ class SearchResult(object):
 
         # Check if they're parsable, if not return False silently
         for port in ports:
-            if re.match("^\d+$", port) is None:
+            if re.match(r"^\d+$", port) is None:
                 return False
 
         # Make a list of all scanned ports
diff --git a/zenmap/zenmapGUI/SearchGUI.py b/zenmap/zenmapGUI/SearchGUI.py
index be812c660..52cfe2706 100644
--- a/zenmap/zenmapGUI/SearchGUI.py
+++ b/zenmap/zenmapGUI/SearchGUI.py
@@ -780,11 +780,11 @@ class DateSubcriterion(Subcriterion):
         self.fuzzies = argument.count("~")
         argument = argument.replace("~", "")
         self.minus_notation = False
-        if re.match("\d\d\d\d-\d\d-\d\d$", argument) is not None:
+        if re.match(r"\d\d\d\d-\d\d-\d\d$", argument) is not None:
             year, month, day = argument.split("-")
             self.date = datetime.date(int(year), int(month), int(day))
             self.argument = argument
-        elif re.match("[-|\+]\d+$", argument) is not None:
+        elif re.match(r"[-|\+]\d+$", argument) is not None:
             # Convert the date from the "-n" notation into YYYY-MM-DD
             parsed_date = datetime.date.fromordinal(
                     datetime.date.today().toordinal() + int(argument))