diff --git a/terraform/modules/networking/main.tf b/terraform/modules/networking/main.tf
index 4da00bc7..baaf5b48 100644
--- a/terraform/modules/networking/main.tf
+++ b/terraform/modules/networking/main.tf
@@ -2,7 +2,7 @@ locals {
   prefix = "${var.domain}-${var.environment}"
 
   // Access the A.B part of the CIDR
-  ab = regex("^(\d+.\d+).", var.vpc_cidr)
+  ab = regex("^(\\d+.\\d+).", var.vpc_cidr)
 }
 
 // VPC
diff --git a/terraform/modules/networking/variables.tf b/terraform/modules/networking/variables.tf
index 985526c9..c73b6b67 100644
--- a/terraform/modules/networking/variables.tf
+++ b/terraform/modules/networking/variables.tf
@@ -17,7 +17,7 @@ variable "vpc_cidr" {
   description = "The IPv4 CIDR block of the VPC. Use ranges from http://www.faqs.org/rfcs/rfc1918.html."
   default = "10.0.0.0/16"
   validation {
-    condition = can(regex("^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}\/\d+$"))
+    condition = can(regex("^((25[0-5]|(2[0-4]|1\\d|[1-9]|)\\d)\\.?\\b){4}\\/\\d+$"))
     error_message = "Must be a valid IPv4 address of the form A.B.C.D/E"
   }
 }