Yarr: lookbehind JIT (incl. unicode), alternation factoring, first-character dispatch, and Boyer-Moore search selection#299

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dylan-conway wants to merge 13 commits into

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claude/yarr-regex-perf-5197

Commits on Jul 16, 2026

Yarr JIT: compile lookbehind assertions
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Yarr: factor alternation prefixes and fold large alternations into a group
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Yarr JIT: dispatch a group's alternatives on the first character
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Yarr: also factor alternation prefixes inside pre-existing groups
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Yarr: harden alternation factoring against specialized group shapes
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Yarr JIT: compare dispatched literal alternatives inline
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Yarr: fix review findings in the lookbehind/alternation series
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Yarr: keep BOL-group lookbehind patterns on the interpreter instead of narrowing BOL bubbling
dylan-conway
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