diff --git a/scripts/decrypt_bios.ts b/scripts/decrypt_bios.ts
index 52fd0eb..ae126a9 100644
--- a/scripts/decrypt_bios.ts
+++ b/scripts/decrypt_bios.ts
@@ -165,7 +165,7 @@ export let Sony: BIOSDecoder = {
     model: BIOSModels.Sony,
     name: "Sony",
     examples: ["1234567"],
-    check: (s) => /\d{7}/gi.test(s),
+    check: (s) => /^\d{7}$/i.test(s),
     solve: (s) => {
         let res = SonySolver(s);
         return res ? [res] : [];
@@ -176,7 +176,7 @@ export let Samsung: BIOSDecoder = {
     model: BIOSModels.Samsung,
     name: "Samsung",
     examples: ["07088120410C0000"],
-    check: (s) => /[0-9ABCDEF]+/gi.test(s) && (
+    check: (s) => /^[0-9ABCDEF]+$/i.test(s) && (
         s.length === 12 || s.length === 14 || s.length === 16
     ),
     solve: SamsungSolver
diff --git a/spec/bios.spec.js b/spec/bios.spec.js
index 894e12f..5769643 100644
--- a/spec/bios.spec.js
+++ b/spec/bios.spec.js
@@ -10,6 +10,7 @@ describe("Decryp BIOS", function() {
         expect(bios.Sony.check("1234567")).toBe(true);
         expect(bios.Sony.check("0123456")).toBe(true);
         expect(bios.Sony.check("123o567")).toBe(false);
+        expect(bios.Sony.check("1234567D")).toBe(false);
     });
 
     it("Samsung key for 07088120410C0000 is 12345", function() {
@@ -18,6 +19,8 @@ describe("Decryp BIOS", function() {
 
     it("Samsung input validation", function() {
         expect(bios.Samsung.check("07088120410C0000")).toBe(true);
+        expect(bios.Samsung.check("07088120410C000000")).toBe(false);
+        expect(bios.Samsung.check("07088120410C000O")).toBe(false);
         expect(bios.Samsung.check("07088120410C")).toBe(true);
         expect(bios.Samsung.check("07088120410C00")).toBe(true);
         expect(bios.Samsung.check("0123456")).toBe(false);