swiftlang / swiftlang/swift-experimental-string-processing
SE-0351 was accepted with `mapOutput`, but it's not implemented
@milseman is already working on this.
Since May 18, 2023.
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Description
The proposal for SE-0351 defines a way to map the output of a regex component to reorder captures, flatten nested optionals, or create instances of a custom type. See https://github.com/apple/swift-evolution/blob/main/proposals/0351-regex-builder.md#mapping-output
The proposal was accepted and its status is declared as Implemented (Swift 5.7), but this feature was left out from the compiler.
This is a crucial feature, and I miss it a lot whenever I deal with regexes in Swift. It's not possible to implement it as an extension by external users of the API, because it should have been a builtin component in the DSL tree.
I only found traces of it in the codebase, the PR #455 that implemented it was closed and the follow-up #466 is still in draft.
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