Improved the UK postcode method to filter out more invalid postcodes. Closes jquery-validation#682

James Thompson · jzaefferer · commit bbbf87903da3 · 2013-03-20T12:19:20.000+01:00
Old one allows integers between 5-7 digits which is not valid.

New one is still case insensitive and allows spaces &amp; fixes the above issue.
diff --git a/additional-methods.js b/additional-methods.js
@@ -389,11 +389,10 @@ jQuery.validator.addMethod('phonesUK', function(phone_number, element) {
 // A number of very detailed GB telephone number RegEx patterns can also be found at:
 // http://www.aa-asterisk.org.uk/index.php/Regular_Expressions_for_Validating_and_Formatting_GB_Telephone_Numbers
 
-//Matches UK postcode. based on http://snipplr.com/view/3152/postcode-validation/
-jQuery.validator.addMethod('postcodeUK', function(postcode, element) {
-	postcode = (postcode.toUpperCase()).replace(/\s+/g,'');
-	return this.optional(element) || postcode.match(/^([^QZ][^IJZ]{0,1}\d{1,2})(\d[^CIKMOV]{2})$/) || postcode.match(/^([^QV]\d[ABCDEFGHJKSTUW])(\d[^CIKMOV]{2})$/) || postcode.match(/^([^QV][^IJZ]\d[ABEHMNPRVWXY])(\d[^CIKMOV]{2})$/) || postcode.match(/^(GIR)(0AA)$/) || postcode.match(/^(BFPO)(\d{1,4})$/) || postcode.match(/^(BFPO)(C\/O\d{1,3})$/);
-}, 'Please specify a valid postcode');
+// Matches UK postcode. Does not match to UK Channel Islands that have their own postcodes (non standard UK)
+jQuery.validator.addMethod('postcodeUK', function(value, element) {
+	return this.optional(element) || /^((([A-PR-UWYZ][0-9])|([A-PR-UWYZ][0-9][0-9])|([A-PR-UWYZ][A-HK-Y][0-9])|([A-PR-UWYZ][A-HK-Y][0-9][0-9])|([A-PR-UWYZ][0-9][A-HJKSTUW])|([A-PR-UWYZ][A-HK-Y][0-9][ABEHMNPRVWXY]))\s?([0-9][ABD-HJLNP-UW-Z]{2})|(GIR)\s?(0AA))$/i.test(value);
+}, 'Please specify a valid UK postcode');
 
 // TODO check if value starts with <, otherwise don't try stripping anything
 jQuery.validator.addMethod("strippedminlength", function(value, element, param) {
diff --git a/test/methods.js b/test/methods.js
@@ -662,6 +662,29 @@ test("iban", function() {
 	ok( method( "GB29 NWBK 6016 1331 9268 19"), "Valid IBAN - GB");
 });
 
+test("postcodeUK", function() {
+	var method = methodTest("postcodeUK");
+	ok( method( "AA9A 9AA" ), "Valid postcode" );
+	ok( method( "A9A 9AA" ), "Valid postcode" );
+	ok( method( "A9 9AA" ), "Valid postcode" );
+	ok( method( "A99 9AA" ), "Valid postcode" );
+	ok( method( "AA9 9AA" ), "Valid postcode" );
+	ok( method( "AA99 9AA" ), "Valid postcode" );
+
+	// Channel Island
+	ok(!method( "AAAA 9AA" ), "Invalid postcode" );
+	ok(!method( "AA-2640" ), "Invalid postcode" );
+
+	ok(!method( "AAA AAA" ), "Invalid postcode" );
+	ok(!method( "AA AAAA" ), "Invalid postcode" );
+	ok(!method( "A AAAA" ), "Invalid postcode" );
+	ok(!method( "AAAAA" ), "Invalid postcode" );
+	ok(!method( "999 999" ), "Invalid postcode" );
+	ok(!method( "99 9999" ), "Invalid postcode" );
+	ok(!method( "9 9999" ), "Invalid postcode" );
+	ok(!method( "99999" ), "Invalid postcode" );
+});
+
 test("dateNL", function() {
 	var method = methodTest("dateNL");
 	ok( method( "01-01-1900" ), "Valid date NL" );
