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In the latest Swift, you can create a Regex (iOS 16+) using slash syntax such as /(\d+)/ (to capture 1 or more digits).

You can then access the match using the new firstMatch(of:).

let regex = /(\d+)/
if let match = someString.firstMatch(of: regex) {
    print("1st captured group of digits: \(match.1)")
}

Compile error with slash

But you might run into the following error, especially for Swift packages:

’/’ is not a prefix unary operator.

This is because the literal syntax is disabled since it is a breaking change.

The workaround is to enable the flag:

// swift-tools-version: 5.7

import PackageDescription

let package = Package(...)

for target in package.targets {
    target.swiftSettings = target.swiftSettings ?? []
    target.swiftSettings?.append(
        .unsafeFlags([
            "-enable-bare-slash-regex",
        ])
    )
}

Alternatively, you can use without the literal syntax support by using Regex string initializer.