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--- aws:vpc [29/07/2025 16:30] – [Get subnets in VPC] andrew
+++ aws:vpc [31/07/2025 13:08] (current) – andrew
@@ Line 2: / Line 2: @@
 FIXME intro blurb on VPC, AZ, subnets, IG / NAT gateway
+{{aws:st-setip_iot.png?300 |VPC with two AZ and subnets}}
@@ Line 37: / Line 39: @@
-This works in Cloudformation to tempate the allowed digits in and IPv4 address.
+This works in Cloudformation to tempate the allowed digits in and IPv4 address. Not exhaustively tested.
 <code>
 "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\\/(22))$"
 </code>
+CF Template example:-
+<code yaml>
+  "Parameters": {
+    "VPCCIDR": {
+      "AllowedPattern": "^(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])(\\/(22))$",
+      "ConstraintDescription": "CIDR block parameter must be in the form x.x.x.x/22",
+      "Default": "192.168.192.0/22",
+      "Description": "CIDR block for VPC",
+      "Type": "String"
+    }
+</code>
+This may bea better example:- [[https://ihateregex.io/expr/ip/]]
 ===== IPv6 Regex =====