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Add cursory release note for Regex. #59079

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May 25, 2022
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Add cursory release note for Regex. #59079

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29 changes: 29 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -5,6 +5,31 @@ _**Note:** This is in reverse chronological order, so newer entries are added to

## Swift 5.7

* [SE-0350][]:

The standard library has a new `Regex<Output>` type.

This type represents an _extended regular expression_, allowing more fluent
string processing operations. A `Regex` may be created by
[initialization from a string][SE-0355]:
```
let pattern = "a[bc]+" // matches "a" followed by one or more instances
// of either "b" or "c"
let regex = try! Regex(pattern)
```
Or via a [regex literal][SE-0354]:
```
let regex = #/a[bc]+/#
```
In Swift 6, `/` will also be supported as a delimiter for `Regex` literals.
You can enable this mode in Swift 5.7 with the `-enable-bare-slash-regex`
flag. Doing so will cause some existing expressions that use `/` as an
operator to no longer compile; you can add parentheses or line breaks as a
workaround.

There are [new string-processing algorithms][SE-0357] that support
`String`, `Regex` and arbitrary `Collection` types.

* [SE-0329][]:
New types representing time and clocks were introduced. This includes a protocol `Clock` defining clocks which allow for defining a concept of now and a way to wake up after a given instant. Additionally a new protocol `InstantProtocol` for defining instants in time was added. Furthermore a new protocol `DurationProtocol` was added to define an elapsed duration between two given `InstantProtocol` types. Most commonly the `Clock` types for general use are the `SuspendingClock` and `ContinuousClock` which represent the most fundamental clocks for the system. The `SuspendingClock` type does not progress while the machine is suspended whereas the `ContinuousClock` progresses no matter the state of the machine.

Expand Down Expand Up @@ -9387,8 +9412,12 @@ Swift 1.0
[SE-0346]: <https://github.com/apple/swift-evolution/blob/main/proposals/0346-light-weight-same-type-syntax.md>
[SE-0347]: <https://github.com/apple/swift-evolution/blob/main/proposals/0347-type-inference-from-default-exprs.md>
[SE-0349]: <https://github.com/apple/swift-evolution/blob/main/proposals/0349-unaligned-loads-and-stores.md>
[SE-0350]: <https://github.com/apple/swift-evolution/blob/main/proposals/0350-regex-type-overview.md>
[SE-0352]: <https://github.com/apple/swift-evolution/blob/main/proposals/0352-implicit-open-existentials.md>
[SE-0353]: <https://github.com/apple/swift-evolution/blob/main/proposals/0353-constrained-existential-types.md>
[SE-0354]: <https://github.com/apple/swift-evolution/blob/main/proposals/0354-regex-literals.md>
[SE-0355]: <https://github.com/apple/swift-evolution/blob/main/proposals/0355-regex-syntax-run-time-construction.md>
[SE-0357]: <https://github.com/apple/swift-evolution/blob/main/proposals/0357-regex-string-processing-algorithms.md>
[SE-0358]: <https://github.com/apple/swift-evolution/blob/main/proposals/0358-primary-associated-types-in-stdlib.md>

[SR-75]: <https://bugs.swift.org/browse/SR-75>
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