diff --git a/lemur/plugins/lemur_acme/plugin.py b/lemur/plugins/lemur_acme/plugin.py
index e0e5b495..1835971b 100644
--- a/lemur/plugins/lemur_acme/plugin.py
+++ b/lemur/plugins/lemur_acme/plugin.py
@@ -481,7 +481,7 @@ class ACMEIssuerPlugin(IssuerPlugin):
             "name": "acme_url",
             "type": "str",
             "required": True,
-            "validation": "/^http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+$/",
+            "validation": r"/^http[s]?://(?:[a-zA-Z]|[0-9]|[$-_@.&+]|[!*\(\),]|(?:%[0-9a-fA-F][0-9a-fA-F]))+$/",
             "helpMessage": "Must be a valid web url starting with http[s]://",
         },
         {
@@ -494,7 +494,7 @@ class ACMEIssuerPlugin(IssuerPlugin):
             "name": "email",
             "type": "str",
             "default": "",
-            "validation": "/^?([-a-zA-Z0-9.`?{}]+@\w+\.\w+)$/",
+            "validation": r"/^?([-a-zA-Z0-9.`?{}]+@\w+\.\w+)$/",
             "helpMessage": "Email to use",
         },
         {
diff --git a/lemur/plugins/lemur_sftp/plugin.py b/lemur/plugins/lemur_sftp/plugin.py
index 66784048..2447cc4e 100644
--- a/lemur/plugins/lemur_sftp/plugin.py
+++ b/lemur/plugins/lemur_sftp/plugin.py
@@ -47,7 +47,7 @@ class SFTPDestinationPlugin(DestinationPlugin):
             "type": "int",
             "required": True,
             "helpMessage": "The SFTP port, default is 22.",
-            "validation": "^(6553[0-5]|655[0-2][0-9]\d|65[0-4](\d){2}|6[0-4](\d){3}|[1-5](\d){4}|[1-9](\d){0,3})",
+            "validation": r"^(6553[0-5]|655[0-2][0-9]\d|65[0-4](\d){2}|6[0-4](\d){3}|[1-5](\d){4}|[1-9](\d){0,3})",
             "default": "22",
         },
         {
diff --git a/lemur/plugins/lemur_slack/plugin.py b/lemur/plugins/lemur_slack/plugin.py
index 70d97aa5..3ad22bca 100644
--- a/lemur/plugins/lemur_slack/plugin.py
+++ b/lemur/plugins/lemur_slack/plugin.py
@@ -89,7 +89,7 @@ class SlackNotificationPlugin(ExpirationNotificationPlugin):
             "name": "webhook",
             "type": "str",
             "required": True,
-            "validation": "^https:\/\/hooks\.slack\.com\/services\/.+$",
+            "validation": r"^https:\/\/hooks\.slack\.com\/services\/.+$",
             "helpMessage": "The url Slack told you to use for this integration",
         },
         {