rs-regex-new-hot — measured, still hint
Status
hint. Wall-clock JSONL: rs-regex-new-hot.jsonl. Not corpus-triaged. The 2026-10-22 corpus verdict does not cover this slug. Crate regex 1.13.1, rustc 1.99.1, -C opt-level=3, linux x64, load 0.44. Both sides still call is_match on id-2026. The earlier 2968× pair was rustc 1.94 and regex 1.11.1.
Measurement
| role | case | median_ms | ops | ratio |
|---|---|---|---|---|
| after | Regex::new once | 0.133901 | 2000 | 1 |
| before | Regex::new every iteration | 128.901984 | 2000 | 962.666 |
The pattern is ([A-Za-z]+)-([0-9]{2,4}). Default stays hint.
Unblock
Do not set the default to error from this file alone. Another input or a cold path can erase the difference. Corpus triage is still required before any default change.