Enable case-sensitive LeadingStrings with frequency-based heuristic#124736

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danmoseley wants to merge 10 commits intodotnet:mainfrom

danmoseley:regex-redux/leading-strings-frequency

Commits on Feb 23, 2026

Enable case-sensitive LeadingStrings with frequency-based heuristic

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Use existing Frequency table with simple threshold

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Defer LeadingStrings decision to compare against FixedDistanceSets

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Use early threshold for case-sensitive LeadingStrings instead of deferred comparison

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Add unit tests for frequency-based LeadingStrings heuristic

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Defer LeadingStrings decision: threshold on best FixedDistanceSet

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Remove unnecessary 'in' modifier from HasHighFrequencyChars

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Add comment explaining Negated bail in HasHighFrequencyChars

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Use frequency.Length instead of hardcoded 128

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Defer FindPrefixes computation and combine if blocks

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