fix: Allow single-label domains and missing dots (#25899)

packages/prisma/zod-utils.test.ts

@@ -55,13 +55,14 @@ describe("excludeOrRequireEmailSchema", () => {
     it("accepts long multi-level domains", () => {
       expect(parse("example.co.uk.test.com").success).toBe(true);
     });
+
+    it("accepts single-label domains and missing dots", () => {
+      expect(parse("example").success).toBe(true);
+      expect(parse("@example").success).toBe(true);
+    });
   });
 
   describe("invalid inputs", () => {
-    it("rejects single-label domains and missing dots", () => {
-      expect(parse("example").success).toBe(false);
-      expect(parse("@example").success).toBe(false);
-    });
 
     it("rejects invalid TLD lengths", () => {
       expect(parse("example.c").success).toBe(false);

packages/prisma/zod-utils.ts

@@ -970,7 +970,7 @@ export const excludeOrRequireEmailSchema = z.string().superRefine((val, ctx) =>
   // Accept forms: domain-only, `@domain`, or `local@domain`
   // - Domain labels: alnum, hyphens allowed internally, no leading/trailing hyphen
   // - Require at least one dot and end with an alpha TLD of length ≥2
-  const EMAIL_OR_DOMAIN_PATTERN = /^(?:[a-z0-9._+'-]+@|@)?(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z]{2,}$/i;
+  const EMAIL_OR_DOMAIN_PATTERN = /^(?:[a-z0-9._+'-]+@|@)?(?:[a-z]{2,}|(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z]{2,})$/i;
 
   const isValid = allDomains.every((entry) => EMAIL_OR_DOMAIN_PATTERN.test(entry));