diff --git a/management/mail_log.py b/management/mail_log.py
index ad645d90..5abacc4f 100755
--- a/management/mail_log.py
+++ b/management/mail_log.py
@@ -391,7 +391,7 @@ def scan_postgrey_line(date, log, collector):
     """ Scan a postgrey log line and extract interesting data """
 
     m = re.match(r"action=(greylist|pass), reason=(.*?), (?:delay=\d+, )?client_name=(.*), "
-                 "client_address=(.*), sender=(.*), recipient=(.*)",
+                 r"client_address=(.*), sender=(.*), recipient=(.*)",
                  log)
 
     if m:
@@ -423,7 +423,7 @@ def scan_postfix_smtpd_line(date, log, collector):
 
     # Check if the incoming mail was rejected
 
-    m = re.match("NOQUEUE: reject: RCPT from .*?: (.*?); from=<(.*?)> to=<(.*?)>", log)
+    m = re.match(r"NOQUEUE: reject: RCPT from .*?: (.*?); from=<(.*?)> to=<(.*?)>", log)
 
     if m:
         message, sender, user = m.groups()
@@ -467,7 +467,7 @@ def scan_postfix_smtpd_line(date, log, collector):
 def scan_dovecot_login_line(date, log, collector, protocol_name):
     """ Scan a dovecot login log line and extract interesting data """
 
-    m = re.match("Info: Login: user=<(.*?)>, method=PLAIN, rip=(.*?),", log)
+    m = re.match(r"Info: Login: user=<(.*?)>, method=PLAIN, rip=(.*?),", log)
 
     if m:
         # TODO: CHECK DIT
diff --git a/management/web_update.py b/management/web_update.py
index 825158b3..82cfc3f4 100644
--- a/management/web_update.py
+++ b/management/web_update.py
@@ -167,7 +167,7 @@ def make_domain_config(domain, templates, ssl_certificates, env):
 				proxy_redirect_off = False
 				frame_options_header_sameorigin = False
 				web_sockets = False
-				m = re.search("#(.*)$", url)
+				m = re.search(r"#(.*)$", url)
 				if m:
 					for flag in m.group(1).split(","):
 						if flag == "pass-http-host":
@@ -178,7 +178,7 @@ def make_domain_config(domain, templates, ssl_certificates, env):
 							frame_options_header_sameorigin = True
 						elif flag == "web-sockets":
 							web_sockets = True
-					url = re.sub("#(.*)$", "", url)
+					url = re.sub(r"#(.*)$", "", url)
 
 				nginx_conf_extra += "\tlocation {} {{".format(path)
 				nginx_conf_extra += "\n\t\tproxy_pass {};".format(url)
diff --git a/setup/migrate.py b/setup/migrate.py
index 319acd49..2cd61c85 100755
--- a/setup/migrate.py
+++ b/setup/migrate.py
@@ -23,7 +23,7 @@ def migration_1(env):
 	# Migrate the 'domains' directory.
 	for sslfn in glob.glob(os.path.join( env["STORAGE_ROOT"], 'ssl/domains/*' )):
 		fn = os.path.basename(sslfn)
-		m = re.match("(.*)_(certifiate.pem|cert_sign_req.csr|private_key.pem)$", fn)
+		m = re.match(r"(.*)_(certifiate.pem|cert_sign_req.csr|private_key.pem)$", fn)
 		if m:
 			# get the new name for the file
 			domain_name, file_type = m.groups()
diff --git a/tests/tls.py b/tests/tls.py
index 8795f36a..18b6b7c4 100644
--- a/tests/tls.py
+++ b/tests/tls.py
@@ -96,7 +96,7 @@ def sslyze(opts, port, ok_ciphers):
 			# Failed. Just output the error.
 			out = re.sub("[\\w\\W]*CHECKING HOST\\(S\\) AVAILABILITY\n\\s*-+\n", "", out) # chop off header that shows the host we queried
 		out = re.sub("[\\w\\W]*SCAN RESULTS FOR.*\n\\s*-+\n", "", out) # chop off header that shows the host we queried
-		out = re.sub("SCAN COMPLETED IN .*", "", out)
+		out = re.sub(r"SCAN COMPLETED IN .*", "", out)
 		out = out.rstrip(" \n-") + "\n"
 
 		# Print.
diff --git a/tools/readable_bash.py b/tools/readable_bash.py
index ac4b6448..78a4bc08 100644
--- a/tools/readable_bash.py
+++ b/tools/readable_bash.py
@@ -408,7 +408,7 @@ class BashScript(Grammar):
 		string = re.sub(".* #NODOC\n", "", string)
 		string = re.sub("\n\s*if .*then.*|\n\s*fi|\n\s*else|\n\s*elif .*", "", string)
 		string = quasitokenize(string)
-		string = re.sub("hide_output ", "", string)
+		string = re.sub(r"hide_output ", "", string)
 
 		parser = BashScript.parser()
 		result = parser.parse_string(string)