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[6.4] Fix autopossessification errors - #913

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natecook1000 merged 1 commit into
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Oct 26, 2026
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[6.4] Fix autopossessification errors#913
natecook1000 merged 1 commit into
release/6.4.xfrom
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@natecook1000 natecook1000 commented Oct 26, 2026 •
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Cherry-pick of #911 to the release/6.4.x branch

  • Explanation: Fixes two cases where quantifiers were incorrectly converted to be possessive – quantifiers followed by zero-length repetitions and a special case where digit characters are a subset of word characters, but only when they have the same ASCII-ness.
  • Issue: rdar://191000167
  • Scope: Very narrow: only applies to the optimization pass in the regex engine.
  • Risk: Low: change is confined to regex compilation.
  • Testing: Existing and new unit tests.
  • Reviewed by: @stephentyrone

@natecook1000
Fix autopossessification errors (#911)
41168c4 
- A zero-count quantification should be skipped over
- Digit CC is a subset of Word CC (unless Word CC is ascii only)

rdar://191000167
@natecook1000
natecook1000 merged commit a65f607 into release/6.4.x Oct 26, 2026
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natecook1000 deleted the fix/6.4-backtracking-skipped branch October 26, 2026 18:19
@natecook1000 natecook1000 changed the title Fix autopossessification errors [6.4] Fix autopossessification errors Oct 26, 2026
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