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[6.0] Fix word boundary matching in matches(of:) #746

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natecook1000
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@natecook1000 natecook1000 commented Jun 9, 2024

  • 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: Fix word boundary matching in matches(of:) #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.

A prior change incorrectly treated the start of the `searchBounds` as
an always-valid word boundary, which resulted in a word boundary at
the start of a pattern unconditionally matching at the restart point
when finding all matches in a string.

This change corrects the usage to recognize word boundaries only at
the start of the `subjectBounds`.

rdar://129417643
@natecook1000
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@swift-ci Please test

@stephentyrone stephentyrone merged commit 1ebdc90 into swift/release/6.0 Jun 10, 2024
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@stephentyrone stephentyrone deleted the swift6_word-boundary-subject-bounds branch June 10, 2024 16:04
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