diff --git a/moto/elbv2/models.py b/moto/elbv2/models.py
index fdce9a8c2..a6da0d01c 100644
--- a/moto/elbv2/models.py
+++ b/moto/elbv2/models.py
@@ -582,11 +582,13 @@ class ELBv2Backend(BaseBackend):
                 report='Missing required parameter in Actions[%s].FixedResponseConfig: "StatusCode"'
                 % i
             )
-        if not re.match(r"^(2|4|5)\d\d$", status_code):
+        expression = r"^(2|4|5)\d\d$"
+        if not re.match(expression, status_code):
             raise InvalidStatusCodeActionTypeError(
-                "1 validation error detected: Value '%s' at 'actions.%s.member.fixedResponseConfig.statusCode' failed to satisfy constraint: \
-Member must satisfy regular expression pattern: ^(2|4|5)\d\d$"
-                % (status_code, index)
+                "1 validation error detected: Value '{}' at 'actions.{}.member.fixedResponseConfig.statusCode' failed to satisfy constraint: \
+Member must satisfy regular expression pattern: {}".format(
+                    status_code, index, expression
+                )
             )
         content_type = action.data["fixed_response_config._content_type"]
         if content_type and content_type not in [
@@ -603,16 +605,19 @@ Member must satisfy regular expression pattern: ^(2|4|5)\d\d$"
     def create_target_group(self, name, **kwargs):
         if len(name) > 32:
             raise InvalidTargetGroupNameError(
-                "Target group name '%s' cannot be longer than '32' characters" % name
+                "Target group name '{}' cannot be longer than '32' characters".format(
+                    name
+                )
             )
-        if not re.match("^[a-zA-Z0-9\-]+$", name):
+        if not re.match(r"^[a-zA-Z0-9\-]+$", name):
             raise InvalidTargetGroupNameError(
-                "Target group name '%s' can only contain characters that are alphanumeric characters or hyphens(-)"
-                % name
+                "Target group name '{}' can only contain characters that are alphanumeric characters or hyphens(-)".format(
+                    name
+                )
             )
 
         # undocumented validation
-        if not re.match("(?!.*--)(?!^-)(?!.*-$)^[A-Za-z0-9-]+$", name):
+        if not re.match(r"(?!.*--)(?!^-)(?!.*-$)^[A-Za-z0-9-]+$", name):
             raise InvalidTargetGroupNameError(
                 "1 validation error detected: Value '%s' at 'targetGroup.targetGroupArn.targetGroupName' failed to satisfy constraint: Member must satisfy regular expression pattern: (?!.*--)(?!^-)(?!.*-$)^[A-Za-z0-9-]+$"
                 % name
diff --git a/moto/events/models.py b/moto/events/models.py
index 5f5909907..f68b63e38 100644
--- a/moto/events/models.py
+++ b/moto/events/models.py
@@ -305,12 +305,12 @@ class EventsBackend(BaseBackend):
 
         if principal is None or self.ACCOUNT_ID.match(principal) is None:
             raise JsonRESTError(
-                "InvalidParameterValue", "Principal must match ^(\d{1,12}|\*)$"
+                "InvalidParameterValue", r"Principal must match ^(\d{1,12}|\*)$"
             )
 
         if statement_id is None or self.STATEMENT_ID.match(statement_id) is None:
             raise JsonRESTError(
-                "InvalidParameterValue", "StatementId must match ^[a-zA-Z0-9-_]{1,64}$"
+                "InvalidParameterValue", r"StatementId must match ^[a-zA-Z0-9-_]{1,64}$"
             )
 
         event_bus._permissions[statement_id] = {
diff --git a/moto/packages/httpretty/http.py b/moto/packages/httpretty/http.py
index 20c00707e..1b4379f5b 100644
--- a/moto/packages/httpretty/http.py
+++ b/moto/packages/httpretty/http.py
@@ -134,7 +134,7 @@ def parse_requestline(s):
     ValueError: Not a Request-Line
     """
     methods = "|".join(HttpBaseClass.METHODS)
-    m = re.match(r"(" + methods + ")\s+(.*)\s+HTTP/(1.[0|1])", s, re.I)
+    m = re.match(r"({})\s+(.*)\s+HTTP/(1.[0|1])".format(methods), s, re.I)
     if m:
         return m.group(1).upper(), m.group(2), m.group(3)
     else:
diff --git a/moto/secretsmanager/utils.py b/moto/secretsmanager/utils.py
index 73275ee05..6033db613 100644
--- a/moto/secretsmanager/utils.py
+++ b/moto/secretsmanager/utils.py
@@ -89,7 +89,7 @@ def _exclude_characters(password, exclude_characters):
     for c in exclude_characters:
         if c in string.punctuation:
             # Escape punctuation regex usage
-            c = "\{0}".format(c)
+            c = r"\{0}".format(c)
         password = re.sub(c, "", str(password))
     return password