rb-regexp-new-hot — measured, still hint
Status
hint. Wall-clock JSONL: rb-regexp-new-hot.jsonl. Not corpus-triaged. The 2026-10-22 corpus verdict does not cover this slug.
Measurement
5000 matches of a fixed string. Before Regexp.new each iteration; after compiles once.
| role | case | median_ms | ops | ratio |
|---|---|---|---|---|
| after | regexp_once | 0.565000 | 5000 | 1 |
| before | regexp_each_iter | 2.041000 | 5000 | 3.612 |
Ruby 4.0.8, 2026-10-23. Warm 3, median of 9.
The microbench shows a cost for this one shape. Default stays hint until the shape is corpus-triaged. This ratio is not a general speedup.
Unblock
Do not set the default to error from this file alone. A changing input, a cold path, or another ABI can erase the difference. Corpus triage is still required before any default change.