Merge branch 'wiegandj-add-validation-for-northern-ireland'

Author: dannyvankooten

src/Validator.php

@@ -41,6 +41,7 @@ class Validator
         'SE' => '\d{12}',
         'SI' => '\d{8}',
         'SK' => '\d{10}',
+        'XI' => '(\d{3} ?\d{4} ?\d{2}( ?\d{3})?|[A-Z\d]{5})',
     ];
 
     /**

tests/ValidatorTest.php

@@ -53,6 +53,11 @@ public function testValidateVatNumberFormat(): void
             'SE123456789012',
             'SI12345678',
             'SK1234567890',
+            'XI123456789',
+            'XI123 4567 89',
+            'XI123456789111',
+            'XI123 4567 89 111',
+            'XIHZ6AB',
         ];
 
         $validator = new Validator();
@@ -94,20 +99,23 @@ public function testValidateVatNumberFormat(): void
             'SE12345678901',
             'SI1234567',
             'SK123456789',
+            'XI12345678',
 
             // valid number but with prefix
             'invalid_prefix_IE1234567X',
             'invalid_prefix_ESB1234567C',
             'invalid_prefix_BE0123456789',
             'invalid_prefix_MT12345678',
             'invalid_prefix_LT123456789',
+            'invalid_prefix_XI123456789',
 
             // valid number but with suffix
             'IE1234567X_invalid_suffix',
             'ESB1234567C_invalid_suffix',
             'BE0123456789_invalid_suffix',
             'MT12345678_invalid_suffix',
             'LT123456789_invalid_suffix',
+            'XI123456789_invalid_suffix',
         ];
 
         foreach ($invalid as $format) {