# localizedCaseInsensitiveContains(_:) Returns a Boolean value indicating whether the given string is non-empty and contained within this string by case-insensitive, non-literal search, taking into account the current locale. ``` func localizedCaseInsensitiveContains(_ other: T) -> Bool where T : StringProtocol ``` ## Discussion Locale-independent case-insensitive operation, and other needs, can be achieved by calling `range(of:options:range:locale:)`. Equivalent to: ``` range(of: other, options: .caseInsensitiveSearch, locale: Locale.current) != nil ``` --- 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)