Merge pull request #282 from apple/main-integration-da89bf7

[Integration] main (a0ed7e1) -> swift/main

Author: rxwei

Documentation/Evolution/ProposalOverview.md

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+
+# Regex Proposals
+
+## Regex Type and Overview
+
+- [Proposal](https://github.com/apple/swift-evolution/blob/main/proposals/0350-regex-type-overview.md), [Thread](https://forums.swift.org/t/se-0350-regex-type-and-overview/56530)
+- [Pitch thread](https://forums.swift.org/t/pitch-regex-type-and-overview/56029)
+
+Presents basic Regex type and gives an overview of how everything fits into the overall story 
+
+
+## Regex Builder DSL
+
+- [Proposal](https://github.com/apple/swift-evolution/blob/main/proposals/0351-regex-builder.md), [Thread](https://forums.swift.org/t/se-0351-regex-builder-dsl/56531)
+- [Pitch thread](https://forums.swift.org/t/pitch-regex-builder-dsl/56007)
+
+Covers the result builder approach and basic API.
+
+
+## Run-time Regex Construction
+
+- [Pitch](https://github.com/apple/swift-experimental-string-processing/blob/main/Documentation/Evolution/RegexSyntaxRunTimeConstruction.md)
+- (old) Pitch thread: [Regex Syntax](https://forums.swift.org/t/pitch-regex-syntax/55711)
+    + Brief: Syntactic superset of PCRE2, Oniguruma, ICU, UTS\#18, etc.
+
+Covers the "interior" syntax, extended syntaxes, run-time construction of a regex from a string, and details of `AnyRegexOutput`.
+
+## Regex Literals
+
+- [Draft](https://github.com/apple/swift-experimental-string-processing/pull/187)
+- (Old) original pitch:
+    + [Thread](https://forums.swift.org/t/pitch-regular-expression-literals/52820)
+    + [Update](https://forums.swift.org/t/pitch-regular-expression-literals/52820/90)
+
+
+## String processing algorithms
+
+- [Pitch thread](https://forums.swift.org/t/pitch-regex-powered-string-processing-algorithms/55969)
+
+Proposes a slew of Regex-powered algorithms.
+
+Introduces `CustomMatchingRegexComponent`, which is a monadic-parser style interface for external parsers to be used as components of a regex.
+
+## Unicode for String Processing
+
+- Draft: TBD
+- (Old) [Character class definitions](https://forums.swift.org/t/pitch-character-classes-for-string-processing/52920)
+
+Covers three topics:
+
+- Proposes literal and DSL API for library-defined character classes, Unicode scripts and properties, and custom character classes.
+- Proposes literal and DSL API for options that affect matching behavior.
+- Defines how Unicode scalar-based classes are extended to grapheme clusters in the different semantic and other matching modes.
+
+