# Regex.RegexOutput The output type for this regular expression. ``` typealias RegexOutput = Output ``` ## Discussion A `Regex` instance’s output type depends on whether the `Regex` has captures and how it is created. - A `Regex` created from a string using the `init(_:)` initializer has an output type of [`AnyRegexOutput`](/documentation/Swift/AnyRegexOutput), whether it has captures or not. - A `Regex` without captures created from a regex literal, the `init(_:as:)` initializer, or a `RegexBuilder` closure has a `Substring` output type, where the substring is the portion of the string that was matched. - A `Regex` with captures created from a regex literal or the `init(_:as:)` initializer has a tuple of substrings as its output type. The first component of the tuple is the full portion of the string that was matched, with the remaining components holding the captures. --- 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)