fix(isPostalCode): fix overly permissive BY regexp (#2134)

fixes #2133

Author: pano9000

src/lib/isPostalCode.js

@@ -15,7 +15,7 @@ const patterns = {
   BE: fourDigit,
   BG: fourDigit,
   BR: /^\d{5}-\d{3}$/,
-  BY: /2[1-4]{1}\d{4}$/,
+  BY: /^2[1-4]\d{4}$/,
   CA: /^[ABCEGHJKLMNPRSTVXY]\d[ABCEGHJ-NPRSTV-Z][\s\-]?\d[ABCEGHJ-NPRSTV-Z]\d$/i,
   CH: fourDigit,
   CN: /^(0[1-7]|1[012356]|2[0-7]|3[0-6]|4[0-7]|5[1-7]|6[1-7]|7[1-5]|8[1345]|9[09])\d{4}$/,

test/validators.js

@@ -11311,6 +11311,12 @@ describe('Validators', () => {
           '247710',
           '231960',
         ],
+        invalid: [
+          'test 225320',
+          '211120 test',
+          '317543',
+          '267946',
+        ],
       },
       {
         locale: 'CA',