Is there a way to achieve right-to-left behavior in Swift's new Regex?

DandyLyons · September 19, 2024, 2:24am

Looks like Backward algorithms was mentioned as a future direction for the proposal.

swiftlang/swift-evolution/blob/main/proposals/0357-regex-string-processing-algorithms.md#backward-algorithms

# Regex-powered string processing algorithms

* Proposal: [SE-0357](0357-regex-string-processing-algorithms.md)
* Authors: [Tina Liu](https://github.com/itingliu), [Michael Ilseman](https://github.com/milseman), [Nate Cook](https://github.com/natecook1000), [Tim Vermeulen](https://github.com/timvermeulen)
* Review Manager: [Ben Cohen](https://github.com/airspeedswift)
* Status: **Implemented (Swift 5.7)**
* Implementation: [apple/swift-experimental-string-processing](https://github.com/apple/swift-experimental-string-processing/)
    * Available in nightly toolchain snapshots with `import _StringProcessing`
* Review: ([pitch](https://forums.swift.org/t/pitch-regex-powered-string-processing-algorithms/55969))
         ([review](https://forums.swift.org/t/se-0357-regex-string-processing-algorithms/57225))
     ([acceptance](https://forums.swift.org/t/accepted-with-modifications-se-0357-regex-string-processing-algorithms/58706))
* Previous Revision: [1](https://github.com/swiftlang/swift-evolution/blob/7741017763f528dfbdfa54c6d11f559918ab53e4/proposals/0357-regex-string-processing-algorithms.md)

## Introduction

The Swift standard library's string processing algorithms are underpowered compared to other popular programming and scripting languages. Some of these omissions can be found in `NSString`, but these fundamental algorithms should have a place in the standard library.

We propose:

1. New regex-powered algorithms over strings, bringing the standard library up to parity with scripting languages

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But there does appear to be a pitch in progress to add it.