fix: treat ignored s as a literal character

src/lib/isAlpha.js

@@ -11,7 +11,7 @@ export default function isAlpha(_str, locale = 'en-US', options = {}) {
     if (ignore instanceof RegExp) {
       str = str.replace(ignore, '');
     } else if (typeof ignore === 'string') {
-      str = str.replace(new RegExp(`[${ignore.replace(/[-[\]{}()*+?.,\\^$|#\\s]/g, '\\$&')}]`, 'g'), ''); // escape regex for ignore
+      str = str.replace(new RegExp(`[${ignore.replace(/[-[\]{}()*+?.,\\^$|#]/g, '\\$&')}]`, 'g'), ''); // escape regex for ignore
     } else {
       throw new Error('ignore should be instance of a String or RegExp');
     }

src/lib/isAlphanumeric.js

@@ -11,7 +11,7 @@ export default function isAlphanumeric(_str, locale = 'en-US', options = {}) {
     if (ignore instanceof RegExp) {
       str = str.replace(ignore, '');
     } else if (typeof ignore === 'string') {
-      str = str.replace(new RegExp(`[${ignore.replace(/[-[\]{}()*+?.,\\^$|#\\s]/g, '\\$&')}]`, 'g'), ''); // escape regex for ignore
+      str = str.replace(new RegExp(`[${ignore.replace(/[-[\]{}()*+?.,\\^$|#]/g, '\\$&')}]`, 'g'), ''); // escape regex for ignore
     } else {
       throw new Error('ignore should be instance of a String or RegExp');
     }

test/literal-ignore.test.js

@@ -0,0 +1,27 @@
+import assert from 'assert';
+import validator from '../index';
+
+['isAlpha', 'isAlphanumeric'].forEach((method) => {
+  describe(`${method} literal ignored characters`, () => {
+    it('does not treat an ignored s as whitespace', () => {
+      [' ', '\t', '\n', '\r', '\u00a0'].forEach((space) => {
+        assert.strictEqual(validator[method](`ab${space}cd`, 'en-US', { ignore: 's' }), false);
+      });
+    });
+
+    it('removes a literal s outside the selected alphabet', () => {
+      assert.strictEqual(validator[method]('\u0430s\u0431', 'ru-RU', { ignore: 's' }), true);
+    });
+
+    it('continues to escape regular expression metacharacters', () => {
+      const ignore = '-[]{}()*+?.,\\^$|#';
+      assert.strictEqual(validator[method](`ab${ignore}cd`, 'en-US', { ignore }), true);
+    });
+
+    it('only ignores whitespace when explicitly requested', () => {
+      assert.strictEqual(validator[method]('ab cd', 'en-US', { ignore: ' ' }), true);
+      assert.strictEqual(validator[method]('ab\tcd', 'en-US', { ignore: ' ' }), false);
+      assert.strictEqual(validator[method]('ab\tcd', 'en-US', { ignore: /\s/g }), true);
+    });
+  });
+});