diff --git a/server/lib/validators.test.ts b/server/lib/validators.test.ts
index 99208a5d5..ac95184a5 100644
--- a/server/lib/validators.test.ts
+++ b/server/lib/validators.test.ts
@@ -245,16 +245,31 @@ function runTests() {
         null,
         "Standard ASN should be valid"
     );
+    assertEquals(
+        getResourceRuleValueValidationError("ASN", "  As15169  "),
+        null,
+        "Standard ASN should be valid with mixed case and whitespace"
+    );
     assertEquals(
         getResourceRuleValueValidationError("ASN", "ALL"),
         null,
         "ALL ASN selector should be valid"
     );
+    assertEquals(
+        getResourceRuleValueValidationError("ASN", " all "),
+        null,
+        "ALL ASN selector should be valid with mixed case and whitespace"
+    );
     assertEquals(
         getResourceRuleValueValidationError("ASN", "AS0"),
         null,
         "AS0 alias should be valid"
     );
+    assertEquals(
+        getResourceRuleValueValidationError("ASN", " as0 "),
+        null,
+        "AS0 alias should be valid with mixed case and whitespace"
+    );
     assertEquals(
         getResourceRuleValueValidationError("ASN", "not-an-asn"),
         "Invalid ASN provided",
diff --git a/server/lib/validators.ts b/server/lib/validators.ts
index 5251aae25..ec19bd852 100644
--- a/server/lib/validators.ts
+++ b/server/lib/validators.ts
@@ -101,7 +101,7 @@ export function getResourceRuleValueValidationError(
                 : "Invalid country code provided";
         case "ASN":
             const normalizedValue = value.trim().toUpperCase();
-            return /^AS\d+$/i.test(normalizedValue) ||
+            return /^AS\d+$/.test(normalizedValue) ||
                 normalizedValue === "ALL" ||
                 normalizedValue === "AS0"
                 ? null
diff --git a/src/components/resource-policy/policy-access-rule-validation.ts b/src/components/resource-policy/policy-access-rule-validation.ts
index 2b3ddfb8f..a5c9d32e0 100644
--- a/src/components/resource-policy/policy-access-rule-validation.ts
+++ b/src/components/resource-policy/policy-access-rule-validation.ts
@@ -87,7 +87,7 @@ export function createPolicyRuleValueSchema(t: TranslateFn, match: string) {
                 (value) => {
                     const normalizedValue = value.trim().toUpperCase();
                     return (
-                        /^AS\d+$/i.test(normalizedValue) ||
+                        /^AS\d+$/.test(normalizedValue) ||
                         normalizedValue === "ALL" ||
                         normalizedValue === "AS0"
                     );