Updated RegEx usage and validator name

README.md

@@ -102,7 +102,6 @@ Validator                               | Description
 **isBoolean(str [, options])**          | check if a string is a boolean.<br/>`options` is an object which defaults to `{ loose: false }`. If loose is is set to false, the validator will strictly match ['true', 'false', '0', '1']. If loose is set to true, the validator will also match 'yes', 'no', and will match a valid boolean string of any case. (eg: ['true', 'True', 'TRUE']).
 **isBtcAddress(str)**            | check if the string is a valid BTC address.
 **isByteLength(str [, options])**          | check if the string's length (in UTF-8 bytes) falls in a range.<br/><br/>`options` is an object which defaults to `{min:0, max: undefined}`.
-**isContainerID(str)**                   | check if the string is an ISO6346 shipping container identification.
 **isCreditCard(card, [, options])**                   | check if the string is a credit card.<br/><br/>  options is an optional object that can be supplied with the following key(s): `provider` is an optional key whose value should be a string, and defines the company issuing the credit card.  Valid values include `amex` , `dinersclub` , `discover` , `jcb` , `mastercard` , `unionpay` , `visa` or blank will check for any provider. 
 **isCurrency(str [, options])**            | check if the string is a valid currency amount.<br/><br/>`options` is an object which defaults to `{symbol: '$', require_symbol: false, allow_space_after_symbol: false, symbol_after_digits: false, allow_negatives: true, parens_for_negatives: false, negative_sign_before_digits: false, negative_sign_after_digits: false, allow_negative_sign_placeholder: false, thousands_separator: ',', decimal_separator: '.', allow_decimal: true, require_decimal: false, digits_after_decimal: [2], allow_space_after_digits: false}`.<br/>**Note:** The array `digits_after_decimal` is filled with the exact number of digits allowed not a range, for example a range 1 to 3 will be given as [1, 2, 3].
 **isDataURI(str)**                      | check if the string is a [data uri format](https://developer.mozilla.org/en-US/docs/Web/HTTP/data_URIs).
@@ -130,6 +129,7 @@ Validator                               | Description
 **isIPRange(str [, version])**          | check if the string is an IP Range (version 4 or 6).
 **isISBN(str [, version])**             | check if the string is an ISBN (version 10 or 13).
 **isISIN(str)**                         | check if the string is an [ISIN][ISIN] (stock/security identifier).
+**isISO6346(str)**                      | check if the string is a valid [ISO 6346](https://en.wikipedia.org/wiki/ISO_6346) shipping container identification.
 **isISO6391(str)**                      | check if the string is a valid [ISO 639-1](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) language code.
 **isISO8601(str [, options])**          | check if the string is a valid [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) date. <br/>`options` is an object which defaults to `{ strict: false, strictSeparator: false }`. If `strict` is true, date strings with invalid dates like `2009-02-29` will be invalid. If `strictSeparator` is true, date strings with date and time separated by anything other than a T will be invalid.
 **isISO31661Alpha2(str)**               | check if the string is a valid [ISO 3166-1 alpha-2](https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2) officially assigned country code.

src/index.js

@@ -78,7 +78,6 @@ import isISIN from './lib/isISIN';
 import isISBN from './lib/isISBN';
 import isISSN from './lib/isISSN';
 import isTaxID from './lib/isTaxID';
-import isContainerID from './lib/isContainerID';
 
 import isMobilePhone, { locales as isMobilePhoneLocales } from './lib/isMobilePhone';
 
@@ -88,6 +87,7 @@ import isCurrency from './lib/isCurrency';
 
 import isBtcAddress from './lib/isBtcAddress';
 
+import isISO6346 from './lib/isISO6346';
 import isISO6391 from './lib/isISO6391';
 import isISO8601 from './lib/isISO8601';
 import isRFC3339 from './lib/isRFC3339';
@@ -196,10 +196,10 @@ const validator = {
   isMobilePhoneLocales,
   isPostalCode,
   isPostalCodeLocales,
-  isContainerID,
   isEthereumAddress,
   isCurrency,
   isBtcAddress,
+  isISO6346,
   isISO6391,
   isISO8601,
   isRFC3339,

src/lib/isISO6346.js

@@ -0,0 +1,35 @@
+import assertString from './util/assertString';
+
+// https://en.wikipedia.org/wiki/ISO_6346
+// according to ISO6346 standard, checksum digit is mandatory for freight container but recommended
+// for other container types (J and Z)
+const isISO6346Str = /^[A-Z]{3}(U[0-9]{7})|([J,Z][0-9]{6,7})$/;
+const isDigit = /^[0-9]$/;
+
+export default function isISO6346(str) {
+  assertString(str);
+  str = str.trim();
+  str = str.toUpperCase();
+
+  if (!isISO6346Str.test(str)) return false;
+
+  if (str.length === 11) {
+    let sum = 0;
+    for (let i = 0; i < str.length - 1; i++) {
+      if (!isDigit.test(str[i])) {
+        let convertedCode;
+        const letterCode = str.charCodeAt(i) - 55;
+        if (letterCode < 11) convertedCode = letterCode;
+        else if (letterCode >= 11 && letterCode <= 20) convertedCode = 12 + (letterCode % 11);
+        else if (letterCode >= 21 && letterCode <= 30) convertedCode = 23 + (letterCode % 21);
+        else convertedCode = 34 + (letterCode % 31);
+        sum += convertedCode * (2 ** i);
+      } else sum += str[i] * (2 ** i);
+    }
+
+    const checkSumDigit = sum % 11;
+    return Number(str[str.length - 1]) === checkSumDigit;
+  }
+
+  return true;
+}

test/validators.js

@@ -11837,9 +11837,9 @@ describe('Validators', () => {
     });
   });
 
-  it('should validate containerID', () => {
+  it('should validate ISO6346 shipping containerID', () => {
     test({
-      validator: 'isContainerID',
+      validator: 'isISO6346',
       valid: [
         'HLXU2008419',
         'TGHU7599330',
@@ -11850,6 +11850,7 @@ describe('Validators', () => {
         'EMCU3811879',
         'OOLU8643084',
         'HJCU1922713',
+        'QJRZ123456',
       ],
       invalid: [
         'OOLU1922713',