diff --git a/tests/gold_tests/headers/general-connection-failure-502.test.py b/tests/gold_tests/headers/general-connection-failure-502.test.py
index e0f28f56edd..3c8108bf49c 100644
--- a/tests/gold_tests/headers/general-connection-failure-502.test.py
+++ b/tests/gold_tests/headers/general-connection-failure-502.test.py
@@ -42,6 +42,6 @@
 # Do not start the origin server: We wish to simulate connection refused while hopefully no one else uses this port.
 tr.Processes.Default.Command = \
     (f"{sys.executable} tcp_client.py 127.0.0.1 {ts.Variables.port} www.connectfail502.test-get.txt | "
-     "sed -e '/^Date: /d' -e '/^Server: ATS\//d'")
+     r"sed -e '/^Date: /d' -e '/^Server: ATS\//d'")
 tr.Processes.Default.ReturnCode = 0
 tr.Processes.Default.Streams.stdout = 'general-connection-failure-502.gold'
diff --git a/tests/gold_tests/tls/tls_hooks_client_verify.test.py b/tests/gold_tests/tls/tls_hooks_client_verify.test.py
index beb996553f2..e83bd996e5b 100644
--- a/tests/gold_tests/tls/tls_hooks_client_verify.test.py
+++ b/tests/gold_tests/tls/tls_hooks_client_verify.test.py
@@ -105,10 +105,10 @@
 tr3.Processes.Default.Streams.all = Testers.ContainsExpression("error", "Curl attempt should have failed")
 
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Client verify callback 0 [\da-fx]+? - event is good good HS", "verify callback happens 2 times")
+    r"Client verify callback 0 [\da-fx]+? - event is good good HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Client verify callback 1 [\da-fx]+? - event is good good HS", "verify callback happens 2 times")
+    r"Client verify callback 1 [\da-fx]+? - event is good good HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Client verify callback 0 [\da-fx]+? - event is good error HS", "verify callback happens 2 times")
+    r"Client verify callback 0 [\da-fx]+? - event is good error HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Client verify callback 1 [\da-fx]+? - event is good error HS", "verify callback happens 2 times")
+    r"Client verify callback 1 [\da-fx]+? - event is good error HS", "verify callback happens 2 times")
diff --git a/tests/gold_tests/tls/tls_hooks_verify.test.py b/tests/gold_tests/tls/tls_hooks_verify.test.py
index 156d0349302..267bdd4e223 100644
--- a/tests/gold_tests/tls/tls_hooks_verify.test.py
+++ b/tests/gold_tests/tls/tls_hooks_verify.test.py
@@ -102,15 +102,15 @@
 ts.Disk.diags_log.Content += Testers.ExcludesExpression("SNI=foo.com", "foo.com should not fail in any way")
 
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Server verify callback 0 [\da-fx]+? - event is good SNI=foo.com good HS", "verify callback happens 2 times")
+    r"Server verify callback 0 [\da-fx]+? - event is good SNI=foo.com good HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Server verify callback 1 [\da-fx]+? - event is good SNI=foo.com good HS", "verify callback happens 2 times")
+    r"Server verify callback 1 [\da-fx]+? - event is good SNI=foo.com good HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Server verify callback 0 [\da-fx]+? - event is good SNI=random.com error HS", "verify callback happens 2 times")
+    r"Server verify callback 0 [\da-fx]+? - event is good SNI=random.com error HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Server verify callback 1 [\da-fx]+? - event is good SNI=random.com error HS", "verify callback happens 2 times")
+    r"Server verify callback 1 [\da-fx]+? - event is good SNI=random.com error HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Server verify callback 0 [\da-fx]+? - event is good SNI=bar.com error HS", "verify callback happens 2 times")
+    r"Server verify callback 0 [\da-fx]+? - event is good SNI=bar.com error HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression(
-    "Server verify callback 1 [\da-fx]+? - event is good SNI=bar.com error HS", "verify callback happens 2 times")
+    r"Server verify callback 1 [\da-fx]+? - event is good SNI=bar.com error HS", "verify callback happens 2 times")
 ts.Disk.traffic_out.Content += Testers.ContainsExpression("Server verify callback SNI APIs match=true", "verify SNI names match")
diff --git a/tests/gold_tests/tls/tls_verify.test.py b/tests/gold_tests/tls/tls_verify.test.py
index 3eb2803a407..0551c56f66d 100644
--- a/tests/gold_tests/tls/tls_verify.test.py
+++ b/tests/gold_tests/tls/tls_verify.test.py
@@ -154,4 +154,4 @@
 # Over riding the built in ERROR check since we expect tr3 to fail
 ts.Disk.diags_log.Content = Testers.ExcludesExpression("verification failed", "Make sure the signatures didn't fail")
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
-    "WARNING: SNI \(bad_bar.com\) not in certificate", "Make sure bad_bar name checked failed.")
+    r"WARNING: SNI \(bad_bar.com\) not in certificate", "Make sure bad_bar name checked failed.")
diff --git a/tests/gold_tests/tls/tls_verify2.test.py b/tests/gold_tests/tls/tls_verify2.test.py
index 1e231424356..fdfc6ab58aa 100644
--- a/tests/gold_tests/tls/tls_verify2.test.py
+++ b/tests/gold_tests/tls/tls_verify2.test.py
@@ -153,13 +153,13 @@
 
 # No name checking for the sig-only permissive override for bad_bar
 ts.Disk.diags_log.Content += Testers.ExcludesExpression(
-    "WARNING: SNI \(bad_bar.com\) not in certificate", "bad_bar name checked should be skipped.")
+    r"WARNING: SNI \(bad_bar.com\) not in certificate", "bad_bar name checked should be skipped.")
 ts.Disk.diags_log.Content = Testers.ExcludesExpression(
-    "WARNING: SNI \(foo.com\) not in certificate", "foo name checked should be skipped.")
+    r"WARNING: SNI \(foo.com\) not in certificate", "foo name checked should be skipped.")
 # No checking for the self-signed on random.com.  No messages
 ts.Disk.diags_log.Content += Testers.ExcludesExpression(
-    "WARNING: Core server certificate verification failed for \(random.com\)", "signature check for random.com should be skipped")
+    r"WARNING: Core server certificate verification failed for \(random.com\)", "signature check for random.com should be skipped")
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
-    "WARNING: Core server certificate verification failed for \(random2.com\)", "signature check for random.com should fail'")
+    r"WARNING: Core server certificate verification failed for \(random2.com\)", "signature check for random.com should fail'")
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
-    "WARNING: SNI \(bad_foo.com\) not in certificate", "bad_foo name checked should be checked.")
+    r"WARNING: SNI \(bad_foo.com\) not in certificate", "bad_foo name checked should be checked.")
diff --git a/tests/gold_tests/tls/tls_verify3.test.py b/tests/gold_tests/tls/tls_verify3.test.py
index 560ae2d428a..4e4db2bd9a7 100644
--- a/tests/gold_tests/tls/tls_verify3.test.py
+++ b/tests/gold_tests/tls/tls_verify3.test.py
@@ -144,7 +144,7 @@
 
 # Over riding the built in ERROR check since we expect tr3 to fail
 ts.Disk.diags_log.Content = Testers.ContainsExpression(
-    "WARNING: SNI \(bob.bar.com\) not in certificate", "Make sure bob.bar name checked failed.")
+    r"WARNING: SNI \(bob.bar.com\) not in certificate", "Make sure bob.bar name checked failed.")
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
     r"WARNING: Core server certificate verification failed for \(my.foo.com\). Action=Continue",
     "Make sure default permissive action takes")
diff --git a/tests/gold_tests/tls/tls_verify4.test.py b/tests/gold_tests/tls/tls_verify4.test.py
index 6eea3f50b48..d82ada44d6c 100644
--- a/tests/gold_tests/tls/tls_verify4.test.py
+++ b/tests/gold_tests/tls/tls_verify4.test.py
@@ -185,6 +185,6 @@
 
 # No name checking for the sig-only permissive override for bad_bar
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
-    "Core server certificate verification failed for \(random3.com\). Action=Continue", "Permissive can connect")
+    r"Core server certificate verification failed for \(random3.com\). Action=Continue", "Permissive can connect")
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
-    "Core server certificate verification failed for \(random2.com\). Action=Terminate", "Enforced cannot connect")
+    r"Core server certificate verification failed for \(random2.com\). Action=Terminate", "Enforced cannot connect")
diff --git a/tests/gold_tests/tls/tls_verify_base.test.py b/tests/gold_tests/tls/tls_verify_base.test.py
index 1004e22a132..ccd02abb1d3 100644
--- a/tests/gold_tests/tls/tls_verify_base.test.py
+++ b/tests/gold_tests/tls/tls_verify_base.test.py
@@ -129,6 +129,6 @@
 
 # Over riding the built in ERROR check since we expect tr3 to fail
 ts.Disk.diags_log.Content = Testers.ContainsExpression(
-    "WARNING: SNI \(bad_bar.com\) not in certificate. Action=Terminate", "Make sure bad_bar name checked failed.")
+    r"WARNING: SNI \(bad_bar.com\) not in certificate. Action=Terminate", "Make sure bad_bar name checked failed.")
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
-    "WARNING: SNI \(random.com\) not in certificate. Action=Continue ", "Permissive failure for random")
+    r"WARNING: SNI \(random.com\) not in certificate. Action=Continue ", "Permissive failure for random")
diff --git a/tests/gold_tests/tls/tls_verify_not_pristine.test.py b/tests/gold_tests/tls/tls_verify_not_pristine.test.py
index b2078caa2df..618f454f3e8 100644
--- a/tests/gold_tests/tls/tls_verify_not_pristine.test.py
+++ b/tests/gold_tests/tls/tls_verify_not_pristine.test.py
@@ -98,5 +98,5 @@
 
 # Over riding the built in ERROR check since we expect tr3 to fail
 ts.Disk.diags_log.Content = Testers.ExcludesExpression("verification failed", "Make sure the signatures didn't fail")
-ts.Disk.diags_log.Content += Testers.ContainsExpression("WARNING: SNI \(bar.com\) not in certificate",
+ts.Disk.diags_log.Content += Testers.ContainsExpression(r"WARNING: SNI \(bar.com\) not in certificate",
                                                         "Make sure bad_bar name checked failed.")
diff --git a/tests/gold_tests/tls/tls_verify_override.test.py b/tests/gold_tests/tls/tls_verify_override.test.py
index 1d216e6b02f..ef3654223ca 100644
--- a/tests/gold_tests/tls/tls_verify_override.test.py
+++ b/tests/gold_tests/tls/tls_verify_override.test.py
@@ -268,4 +268,4 @@
     "Failure on missing name for bar.com")
 # See if the explicitly set default sni_policy of remap works.
 ts.Disk.diags_log.Content += Testers.ExcludesExpression(
-    "WARNING: SNI \(foo.com\) not in certificate. Action=Continue", "Warning on missing name for foo.com")
+    r"WARNING: SNI \(foo.com\) not in certificate. Action=Continue", "Warning on missing name for foo.com")
diff --git a/tests/gold_tests/tls/tls_verify_override_sni.test.py b/tests/gold_tests/tls/tls_verify_override_sni.test.py
index 324d9c41669..bb9a394f910 100644
--- a/tests/gold_tests/tls/tls_verify_override_sni.test.py
+++ b/tests/gold_tests/tls/tls_verify_override_sni.test.py
@@ -145,6 +145,6 @@
 
 # Over riding the built in ERROR check since we expect some cases to fail
 ts.Disk.diags_log.Content = Testers.ContainsExpression(
-    "WARNING: SNI \(bar.com\) not in certificate. Action=Continue server=bar.com", "Warning for mismatch name not enforcing")
+    r"WARNING: SNI \(bar.com\) not in certificate. Action=Continue server=bar.com", "Warning for mismatch name not enforcing")
 ts.Disk.diags_log.Content += Testers.ContainsExpression(
-    " WARNING: SNI \(bar.com\) not in certificate. Action=Terminate server=bar.com", "Warning for enforcing mismatch")
+    r" WARNING: SNI \(bar.com\) not in certificate. Action=Terminate server=bar.com", "Warning for enforcing mismatch")
diff --git a/tests/gold_tests/tls_hooks/tls_hooks16.test.py b/tests/gold_tests/tls_hooks/tls_hooks16.test.py
index 61c752cefd3..92e925411db 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks16.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks16.test.py
@@ -66,7 +66,7 @@
 
 snistring = "Client Hello callback 0"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "Client Hello message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "Client Hello message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks17.test.py b/tests/gold_tests/tls_hooks/tls_hooks17.test.py
index ca2acd49cf8..98fb6dd85c5 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks17.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks17.test.py
@@ -66,7 +66,7 @@
 
 snistring = "Client Hello callback 0"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "Client Hello message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "Client Hello message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks18.test.py b/tests/gold_tests/tls_hooks/tls_hooks18.test.py
index c0aaa98f9f3..d3c7d588068 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks18.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks18.test.py
@@ -67,9 +67,9 @@
 certstring0 = "Client Hello callback 0"
 certstring1 = "Client Hello callback 1"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring0), "Cert message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring0), "Cert message appears only once", reflags=re.S | re.M)
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring1), "Cert message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring1), "Cert message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks2.test.py b/tests/gold_tests/tls_hooks/tls_hooks2.test.py
index 24a34e0887d..2bbe917c293 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks2.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks2.test.py
@@ -62,7 +62,7 @@
 
 snistring = "SNI callback 0"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "SNI message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "SNI message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks3.test.py b/tests/gold_tests/tls_hooks/tls_hooks3.test.py
index 69e50fae320..c6c89e089d5 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks3.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks3.test.py
@@ -62,7 +62,7 @@
 
 certstring = "Cert callback 0"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring), "Cert message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring), "Cert message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks4.test.py b/tests/gold_tests/tls_hooks/tls_hooks4.test.py
index 922ad679b3d..b1be3add7fa 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks4.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks4.test.py
@@ -63,11 +63,11 @@
 preacceptstring = "Pre accept callback 0"
 certstring = "Cert callback 0"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "SNI message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring), "SNI message appears only once", reflags=re.S | re.M)
 # the preaccept may get triggered twice because the test framework creates a TCP connection before handing off to traffic_server
-ts.Disk.traffic_out.Content += Testers.ContainsExpression("\A(?:(?!{0}).)*{0}.*({0})?(?!.*{0}).*\Z".format(
+ts.Disk.traffic_out.Content += Testers.ContainsExpression(r"\A(?:(?!{0}).)*{0}.*({0})?(?!.*{0}).*\Z".format(
     preacceptstring), "Pre accept message appears only once or twice", reflags=re.S | re.M)
-ts.Disk.traffic_out.Content += Testers.ContainsExpression("\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring),
+ts.Disk.traffic_out.Content += Testers.ContainsExpression(r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring),
                                                           "Cert message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks7.test.py b/tests/gold_tests/tls_hooks/tls_hooks7.test.py
index 5aa0201975b..52a55a164af 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks7.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks7.test.py
@@ -63,9 +63,9 @@
 snistring0 = "SNI callback 0"
 snistring1 = "SNI callback 1"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring0), "SNI message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring0), "SNI message appears only once", reflags=re.S | re.M)
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring1), "SNI message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(snistring1), "SNI message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks8.test.py b/tests/gold_tests/tls_hooks/tls_hooks8.test.py
index 3b337606f7a..19db5b62d58 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks8.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks8.test.py
@@ -63,9 +63,9 @@
 certstring0 = "Cert callback 0"
 certstring1 = "Cert callback 1"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring0), "Cert message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring0), "Cert message appears only once", reflags=re.S | re.M)
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring1), "Cert message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring1), "Cert message appears only once", reflags=re.S | re.M)
 
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15
diff --git a/tests/gold_tests/tls_hooks/tls_hooks9.test.py b/tests/gold_tests/tls_hooks/tls_hooks9.test.py
index 4001e02bd2c..4ab72467b39 100644
--- a/tests/gold_tests/tls_hooks/tls_hooks9.test.py
+++ b/tests/gold_tests/tls_hooks/tls_hooks9.test.py
@@ -62,6 +62,6 @@
 
 certstring0 = "Cert callback 0"
 ts.Disk.traffic_out.Content = Testers.ContainsExpression(
-    "\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring0), "Cert message appears only once", reflags=re.S | re.M)
+    r"\A(?:(?!{0}).)*{0}(?!.*{0}).*\Z".format(certstring0), "Cert message appears only once", reflags=re.S | re.M)
 tr.Processes.Default.TimeOut = 15
 tr.TimeOut = 15