[6.0] Fix word boundary matching in `matches(of:)`

swiftlang / swift-experimental-string-processing

An early experimental general-purpose pattern matching engine for Swift.

Apache License 2.0

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Closed natecook1000 closed 4 months ago

natecook1000 commented 4 months ago

Explanation: Fixes a regression in Swift 5.9.2 where \b matches at every position in a matches(of:) search when used at the beginning of a pattern.
Original PR: #744
Risk: Low. Already on main.
Reviewed by: @milseman
Resolves: rdar://129417643
Tests: Full swift-ci testing and full string-processing package testing

Cherry pick of #744 to the swift/release/6.0 branch.

natecook1000 commented 4 months ago

@swift-ci Please test