# CFStringTokenizerCreate(_:_:_:_:_:) Returns a tokenizer for a given string. ``` func CFStringTokenizerCreate(_ alloc: CFAllocator!, _ string: CFString!, _ range: CFRange, _ options: CFOptionFlags, _ locale: CFLocale!) -> CFStringTokenizer! ``` ## Parameters `alloc` The allocator to use to allocate memory for the new object. Pass `NULL` or [`kCFAllocatorDefault`](/documentation/CoreFoundation/kCFAllocatorDefault) to use the current default allocator. `string` The string to tokenize. `range` The range of the characters in `string` to tokenize. `options` A tokenization unit option that specifies how `string` should be tokenized. The options can be modified by adding unit modifier options to tell the tokenizer to prepare specified attributes when it tokenizes `string`. For possible values, see [Tokenization Modifiers](/documentation/CoreFoundation/1588024-tokenization-modifiers). `locale` A locale that specifies language- or region-specific behavior for the tokenization. You can pass `NULL` to use the default system locale, although this is typically not recommended—instead use [`CFLocaleCopyCurrent()`](/documentation/CoreFoundation/CFLocaleCopyCurrent()) to specify the locale of the current user. For more information, see [Tokenization Modifiers](/documentation/CoreFoundation/1588024-tokenization-modifiers). ## Return Value A tokenizer to analyze the range `range` of `string` for the given locale and options. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029). ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)