Regex is only available in macOS 9999 or newer

[christopherweems]

To try out the functionality provided here, download the latest open source development toolchain. Import _StringProcessing in your source file to get access to the API and specify -Xfrontend -enable-experimental-string-processing to get access to the literals.

Following these steps from the README doesn't seem to be all that is necessary to try out the Regex features with the swift-DEVELOPMENT-SNAPSHOT-2022-04-21-a-osx toolchain.

[christopherweems]

I've found a workable solution to my problem. If you know you're developing a package that will only support platforms that include the string processing APIs, you can disable availibility checking for now by adding the setting .unsafeFlags(["-Xfrontend", "-disable-availability-checking"]) to your package manifest.

Related thread: https://forums.swift.org/t/new-concurrency-api-not-available-in-latest-toolchain/47389/2

[milseman]

@rxwei is this the suggested workaround, and if so should we update the README?

[rxwei]

That is the correct workaround.