Add RFC 9562 mentions. Closes #4872

Author: colinhacks

packages/docs/content/api.mdx

@@ -290,7 +290,7 @@ z.uuidv6();
 z.uuidv7();
 ```
 
-The RFC 4122 UUID spec requires the first two bits of byte 8 to be `10`. Other UUID-like identifiers do not enforce this constraint. To validate any UUID-like identifier:
+The RFC 9562/4122 UUID spec requires the first two bits of byte 8 to be `10`. Other UUID-like identifiers do not enforce this constraint. To validate any UUID-like identifier:
 
 ```ts
 z.guid();

packages/docs/content/v4/changelog.mdx

@@ -322,10 +322,10 @@ z.email(); // ✅
 
 ### stricter `.uuid()`
 
-The `z.uuid()` now validates UUIDs more strictly against the RFC 4122 specification; specifically, the variant bits must be `10` per the spec. For a more permissive "UUID-like" validator, use `z.guid()`.
+The `z.uuid()` now validates UUIDs more strictly against the RFC 9562/4122 specification; specifically, the variant bits must be `10` per the spec. For a more permissive "UUID-like" validator, use `z.guid()`.
 
 ```ts
-z.uuid(); // RFC 4122 compliant UUID
+z.uuid(); // RFC 9562/4122 compliant UUID
 z.guid(); // any 8-4-4-4-12 hex pattern
 ```
 

packages/zod/src/v3/tests/string.test.ts

@@ -342,8 +342,8 @@ test("uuid", () => {
   uuid.parse("9491d710-3185-4e06-bea0-6a2f275345e0");
   uuid.parse("d89e7b01-7598-ed11-9d7a-0022489382fd"); // new sequential id
   uuid.parse("00000000-0000-0000-0000-000000000000");
-  uuid.parse("b3ce60f8-e8b9-40f5-1150-172ede56ff74"); // Variant 0 - RFC 4122: Reserved, NCS backward compatibility
-  uuid.parse("92e76bf9-28b3-4730-cd7f-cb6bc51f8c09"); // Variant 2 - RFC 4122: Reserved, Microsoft Corporation backward compatibility
+  uuid.parse("b3ce60f8-e8b9-40f5-1150-172ede56ff74"); // Variant 0 - RFC 9562/4122: Reserved, NCS backward compatibility
+  uuid.parse("92e76bf9-28b3-4730-cd7f-cb6bc51f8c09"); // Variant 2 - RFC 9562/4122: Reserved, Microsoft Corporation backward compatibility
   const result = uuid.safeParse("9491d710-3185-4e06-bea0-6a2f275345e0X");
   expect(result.success).toEqual(false);
   if (!result.success) {

packages/zod/src/v4/classic/tests/string.test.ts

@@ -464,8 +464,8 @@ test(`bad uuid`, () => {
     "9491d710-3185-0e06-bea0-6a2f275345e0",
     "9491d710-3185-5e06-0ea0-6a2f275345e0",
     "d89e7b01-7598-ed11-9d7a-0022489382fd", // new sequential id
-    "b3ce60f8-e8b9-40f5-1150-172ede56ff74", // Variant 0 - RFC 4122: Reserved, NCS backward compatibility
-    "92e76bf9-28b3-4730-cd7f-cb6bc51f8c09", // Variant 2 - RFC 4122: Reserved, Microsoft Corporation backward compatibility
+    "b3ce60f8-e8b9-40f5-1150-172ede56ff74", // Variant 0 - RFC 9562/4122: Reserved, NCS backward compatibility
+    "92e76bf9-28b3-4730-cd7f-cb6bc51f8c09", // Variant 2 - RFC 9562/4122: Reserved, Microsoft Corporation backward compatibility
     "invalid uuid",
     "9491d710-3185-4e06-bea0-6a2f275345e0X",
     "ffffffff-ffff-ffff-ffff-ffffffffffff",
@@ -481,8 +481,8 @@ test("good guid", () => {
   for (const goodGuid of [
     "9491d710-3185-4e06-bea0-6a2f275345e0",
     "d89e7b01-7598-ed11-9d7a-0022489382fd", // new sequential id
-    "b3ce60f8-e8b9-40f5-1150-172ede56ff74", // Variant 0 - RFC 4122: Reserved, NCS backward compatibility
-    "92e76bf9-28b3-4730-cd7f-cb6bc51f8c09", // Variant 2 - RFC 4122: Reserved, Microsoft Corporation backward compatibility
+    "b3ce60f8-e8b9-40f5-1150-172ede56ff74", // Variant 0 - RFC 9562/4122: Reserved, NCS backward compatibility
+    "92e76bf9-28b3-4730-cd7f-cb6bc51f8c09", // Variant 2 - RFC 9562/4122: Reserved, Microsoft Corporation backward compatibility
     "00000000-0000-0000-0000-000000000000",
     "ffffffff-ffff-ffff-ffff-ffffffffffff",
   ]) {

packages/zod/src/v4/core/regexes.ts

@@ -16,7 +16,7 @@ export const extendedDuration: RegExp =
 /** A regex for any UUID-like identifier: 8-4-4-4-12 hex pattern */
 export const guid: RegExp = /^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12})$/;
 
-/** Returns a regex for validating an RFC 4122 UUID.
+/** Returns a regex for validating an RFC 9562/4122 UUID.
  *
  * @param version Optionally specify a version 1-8. If no version is specified, all versions are supported. */
 export const uuid = (version?: number | undefined): RegExp => {