diff --git a/README.md b/README.md
index 9372230e7..d95bb9c86 100644
--- a/README.md
+++ b/README.md
@@ -139,7 +139,7 @@ Validator | Description
**isJSON(str [, options])** | check if the string is valid JSON (note: uses JSON.parse).
`options` is an object which defaults to `{ allow_primitives: false }`. If `allow_primitives` is true, the primitives 'true', 'false' and 'null' are accepted as valid JSON values.
**isJWT(str)** | check if the string is valid JWT token.
**isLatLong(str [, options])** | check if the string is a valid latitude-longitude coordinate in the format `lat,long` or `lat, long`.
`options` is an object that defaults to `{ checkDMS: false }`. Pass `checkDMS` as `true` to validate DMS(degrees, minutes, and seconds) latitude-longitude format.
-**isLength(str [, options])** | check if the string's length falls in a range.
`options` is an object which defaults to `{min:0, max: undefined}`. Note: this function takes into account surrogate pairs.
+**isLength(str [, options])** | check if the string's length falls in a range and equal to any of the integers of the `discreteLengths` array if provided.
`options` is an object which defaults to `{min:0, max: undefined, discreteLengths: undefined}`. Note: this function takes into account surrogate pairs.
**isLicensePlate(str [, locale])** | check if string matches the format of a country's license plate.
(locale is one of `['cs-CZ', 'de-DE', 'de-LI', 'fi-FI', 'pt-BR', 'pt-PT', 'sq-AL', 'sv-SE', 'en-IN', 'hi-IN', 'gu-IN', 'as-IN', 'bn-IN', 'kn-IN', 'ml-IN', 'mr-IN', 'or-IN', 'pa-IN', 'sa-IN', 'ta-IN', 'te-IN', 'kok-IN']` or `any`)
**isLocale(str)** | check if the string is a locale
**isLowercase(str)** | check if the string is lowercase.
diff --git a/src/lib/isLength.js b/src/lib/isLength.js
index 4ef8b83eb..3ca7d339c 100644
--- a/src/lib/isLength.js
+++ b/src/lib/isLength.js
@@ -5,6 +5,7 @@ export default function isLength(str, options) {
assertString(str);
let min;
let max;
+
if (typeof (options) === 'object') {
min = options.min || 0;
max = options.max;
@@ -12,8 +13,15 @@ export default function isLength(str, options) {
min = arguments[1] || 0;
max = arguments[2];
}
+
const presentationSequences = str.match(/(\uFE0F|\uFE0E)/g) || [];
const surrogatePairs = str.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g) || [];
const len = str.length - presentationSequences.length - surrogatePairs.length;
- return len >= min && (typeof max === 'undefined' || len <= max);
+ const isInsideRange = len >= min && (typeof max === 'undefined' || len <= max);
+
+ if (isInsideRange && Array.isArray(options?.discreteLengths)){
+ return options.discreteLengths.some(discreteLen => discreteLen === len);
+ }
+
+ return isInsideRange;
}
diff --git a/test/validators.js b/test/validators.js
index c0e36bec7..bdd8f9a20 100644
--- a/test/validators.js
+++ b/test/validators.js
@@ -4816,12 +4816,42 @@ describe('Validators', () => {
valid: ['abc', 'de', 'a', ''],
invalid: ['abcd'],
});
+ test({
+ validator: 'isLength',
+ args: [{ max: 6, discreteLengths: 5 }],
+ valid: ['abcd', 'vfd', 'ff', '', 'k'],
+ invalid: ['abcdefgh', 'hfjdksks'],
+ });
+ test({
+ validator: 'isLength',
+ args: [{ min: 2, max: 6, discreteLengths: 5 }],
+ valid: ['bsa', 'vfvd', 'ff'],
+ invalid: ['', ' ', 'hfskdunvc'],
+ });
+ test({
+ validator: 'isLength',
+ args: [{ min: 1, discreteLengths: 2 }],
+ valid: [' ', 'hello', 'bsa'],
+ invalid: [''],
+ });
test({
validator: 'isLength',
args: [{ max: 0 }],
valid: [''],
invalid: ['a', 'ab'],
});
+ test({
+ validator: 'isLength',
+ args: [{ min: 5, max: 10, discreteLengths: [2, 6, 8, 9] }],
+ valid: ['helloguy', 'shopping', 'validator', 'length'],
+ invalid: ['abcde', 'abcdefg'],
+ });
+ test({
+ validator: 'isLength',
+ args: [{ discreteLengths: '9' }],
+ valid: ['a', 'abcd', 'abcdefghijkl'],
+ invalid: [],
+ });
test({
validator: 'isLength',
valid: ['a', '', 'asds'],