---
title: Regex.RegexOutput
framework: swift
role: symbol
role_heading: Type Alias
path: swift/regex/regexoutput
---

# Regex.RegexOutput

The output type for this regular expression.

## Declaration

```swift
typealias RegexOutput = Output
```

## Discussion

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, 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.