# contains(captureNamed:) Returns a Boolean value indicating whether a named capture with the given name exists. ``` func contains(captureNamed name: String) -> Bool ``` ## Parameters `name` The name to look for among the regular expression’s capture groups. Capture group names are case sensitive. ## Discussion This example shows a regular expression that includes capture groups named `key` and `value`: ``` let regex = try Regex("(?'key'.+?): (?'value'.+)") regex.contains(captureNamed: "key") // true regex.contains(captureNamed: "VALUE") // false regex.contains(captureNamed: "1") // false ``` --- 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)