Closes [#952](#952)

README.md

@@ -155,6 +155,7 @@ Sanitizer                              | Description
 **toInt(input [, radix])**             | convert the input string to an integer, or `NaN` if the input is not an integer.
 **trim(input [, chars])**              | trim characters (whitespace by default) from both sides of the input.
 **whitelist(input, chars)**            | remove characters that do not appear in the whitelist. The characters are used in a RegExp and so you will need to escape some chars, e.g. `whitelist(input, '\\[\\]')`.
+**isSlug**                             | Check if the string is of type slug. `Options` allow a single hyphen between string. e.g. [`cn-cn`, `cn-c-c`]
 
 ### XSS Sanitization
 

index.js

@@ -153,6 +153,8 @@ var _isWhitelisted = _interopRequireDefault(require("./lib/isWhitelisted"));
 
 var _normalizeEmail = _interopRequireDefault(require("./lib/normalizeEmail"));
 
+var _isSlug = _interopRequireDefault(require("./lib/isSlug"));
+
 function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
 
 function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
@@ -239,7 +241,8 @@ var validator = {
   blacklist: _blacklist.default,
   isWhitelisted: _isWhitelisted.default,
   normalizeEmail: _normalizeEmail.default,
-  toString: toString
+  toString: toString,
+  isSlug: _isSlug.default
 };
 var _default = validator;
 exports.default = _default;

lib/isSlug.js

@@ -0,0 +1,20 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = isSlug;
+
+var _assertString = _interopRequireDefault(require("./util/assertString"));
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+var charsetRegex = /^[^-_](?!.*?[-_]{2,})([a-z0-9\\-]{1,}).*[^-_]$/;
+
+function isSlug(str) {
+  (0, _assertString.default)(str);
+  return charsetRegex.test(str);
+}
+
+module.exports = exports.default;
+module.exports.default = exports.default;

src/index.js

@@ -97,6 +97,8 @@ import isWhitelisted from './lib/isWhitelisted';
 
 import normalizeEmail from './lib/normalizeEmail';
 
+import isSlug from './lib/isSlug';
+
 const version = '11.1.0';
 
 const validator = {
@@ -181,6 +183,7 @@ const validator = {
   isWhitelisted,
   normalizeEmail,
   toString,
+  isSlug,
 };
 
 export default validator;

src/lib/isSlug.js

@@ -0,0 +1,8 @@
+import assertString from './util/assertString';
+
+let charsetRegex = /^[^-_](?!.*?[-_]{2,})([a-z0-9\\-]{1,}).*[^-_]$/;
+
+export default function isSlug(str) {
+  assertString(str);
+  return (charsetRegex.test(str));
+}

test/validators.js

@@ -6910,4 +6910,20 @@ describe('Validators', () => {
       ],
     });
   });
+
+  it('should validate slug', () => {
+    test({
+      validator: 'isSlug',
+      args: ['cs_67CZ'],
+      valid: ['cs-cz', 'cscz'],
+      invalid: [
+        'not-----------slug',
+        '@#_$@',
+        '-not-slug',
+        'not-slug-',
+        '_not-slug',
+        'not-slug_',
+      ],
+    });
+  });
 });

validator.js

@@ -2027,6 +2027,12 @@ function normalizeEmail(email, options) {
   return parts.join('@');
 }
 
+var charsetRegex = /^[^-_](?!.*?[-_]{2,})([a-z0-9\\-]{1,}).*[^-_]$/;
+function isSlug(str) {
+  assertString(str);
+  return charsetRegex.test(str);
+}
+
 var version = '11.1.0';
 var validator = {
   version: version,
@@ -2109,7 +2115,8 @@ var validator = {
   blacklist: blacklist$1,
   isWhitelisted: isWhitelisted,
   normalizeEmail: normalizeEmail,
-  toString: toString
+  toString: toString,
+  isSlug: isSlug
 };
 
 return validator;