diff --git a/eslint.config.mjs b/eslint.config.mjs
index f8d748e6..11788c7a 100644
--- a/eslint.config.mjs
+++ b/eslint.config.mjs
@@ -24,7 +24,6 @@ export default [
 
     rules: {
       semi: ['error', 'always'],
-      quotes: ['error', 'single'],
       '@typescript-eslint/explicit-function-return-type': 'off',
       '@typescript-eslint/no-explicit-any': 'error',
 
diff --git a/src/cookie/cookie.test.ts b/src/cookie/cookie.test.ts
index ffeaa08c..34d2a97e 100644
--- a/src/cookie/cookie.test.ts
+++ b/src/cookie/cookie.test.ts
@@ -106,7 +106,6 @@ describe('Cookie Util Tests', () => {
   });
 
   describe('getLangCookie', () => {
-    // eslint-disable-next-line quotes
     it("get user's lang in cookie", () => {
       const getCookieSpy = vi.spyOn(Cookies, 'get');
       Cookies.set(CookieKeys.Lang, MOCK_LANG);
@@ -116,7 +115,6 @@ describe('Cookie Util Tests', () => {
   });
 
   describe('setLangCookie', () => {
-    // eslint-disable-next-line quotes
     it("save user's lang in cookie", () => {
       const mock = vi.spyOn(Cookies, 'set');
       setLangCookie(MOCK_LANG, MOCK_DOMAIN);
diff --git a/src/member/constants.test.ts b/src/member/constants.test.ts
index 69301a77..e3e4157c 100644
--- a/src/member/constants.test.ts
+++ b/src/member/constants.test.ts
@@ -3,44 +3,14 @@ import { describe, expect, it } from 'vitest';
 import { MemberConstants } from './constants.js';
 
 describe('Member constants', () => {
-  const invalidUsername = '<div>';
-  // prettier-ignore
-  const invalidUsername1 = 'user1234%66457657\'';
-  const invalidUsername2 = '  user\u{001A}';
-  const invalidUsername3 = '\u{008F}USER';
-  const validUsername = 'Johnny';
-  // prettier-ignore
-  const validUsername1 = 'Jéàn de l\'Avoiné';
-
-  it('username forbidden characters regex', () => {
-    expect(invalidUsername).toMatch(
-      MemberConstants.USERNAME_FORBIDDEN_CHARS_REGEX,
-    );
-    expect(invalidUsername1).toMatch(
-      MemberConstants.USERNAME_FORBIDDEN_CHARS_REGEX,
-    );
-    expect(invalidUsername2).toMatch(
-      MemberConstants.USERNAME_FORBIDDEN_CHARS_REGEX,
-    );
-    expect(invalidUsername3).toMatch(
-      MemberConstants.USERNAME_FORBIDDEN_CHARS_REGEX,
-    );
-
-    expect(validUsername).not.toMatch(
-      MemberConstants.USERNAME_FORBIDDEN_CHARS_REGEX,
-    );
-    expect(validUsername1).not.toMatch(
-      MemberConstants.USERNAME_FORBIDDEN_CHARS_REGEX,
-    );
+  it.each(['Johnny', "Jéàn de l'Avoiné"])('valid username', (username) => {
+    expect(username).toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
   });
 
-  it('username format regex', () => {
-    expect(invalidUsername).not.toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
-    expect(invalidUsername1).not.toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
-    expect(invalidUsername2).not.toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
-    expect(invalidUsername3).not.toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
-
-    expect(validUsername).toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
-    expect(validUsername1).toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
-  });
+  it.each(['<div>', "user1234%66457657'", '  user\u{001A}', '\u{008F}USER'])(
+    'invalid username',
+    (username) => {
+      expect(username).not.toMatch(MemberConstants.USERNAME_FORMAT_REGEX);
+    },
+  );
 });
diff --git a/src/member/constants.ts b/src/member/constants.ts
index d976de35..19187831 100644
--- a/src/member/constants.ts
+++ b/src/member/constants.ts
@@ -1,5 +1,3 @@
 export const MemberConstants = {
-  USERNAME_FORBIDDEN_CHARS_REGEX:
-    /["<>^%\\\u{0000}-\u{001F}\u{007F}-\u{009F}]+/u,
   USERNAME_FORMAT_REGEX: /^[^"<>^%\\\u{0000}-\u{001F}\u{007F}-\u{009F}]+$/u,
 };
diff --git a/src/validation/isEmail.test.ts b/src/validation/isEmail.test.ts
index 5fcd4e03..a68ef437 100644
--- a/src/validation/isEmail.test.ts
+++ b/src/validation/isEmail.test.ts
@@ -158,7 +158,6 @@ describe('isEmail', () => {
         'Some Name <hans@m端ller.com>',
         'Some Name <test|123@m端ller.com>',
         'Some Name <test123+ext@gmail.com>',
-        // eslint-disable-next-line quotes
         "'Foo Bar, Esq'<foo@bar.com>",
         'Some Name <some.name.midd.leNa.me+extension@GoogleMail.com>',
         'Some Middle Name <some.name.midd.leNa.me+extension@GoogleMail.com>',