regex::is_match, find, find_all, replace, replace_all, split, captures
all called Regex::new(pattern) per invocation. A script doing
`regex::is_match("\\d+", x)` in a tight loop paid the compile every
iteration. Regex compile dominates is_match on short strings.
Add a thread-local LruCache<String, Arc<Regex>> (cap 128). The
compile helper now memoises by pattern string, returning Arc<Regex>
on hit. Cap is well above what any sensible script uses but bounded
enough to keep memory predictable on long-running threads.
AUDIT.md anchor: F-P-014.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Adds the v1.1.0 user-visible stdlib: regex, random, time, json, base64,
hex, url — each exposed as a `::` namespace mirroring the existing
`log::` pattern. Modules register once at engine build via
`Engine::register_static_module`, distinct from the stateful service
modules (KV, docs, …) that hook into `sdk::register_all` per call.
- regex: linear-time, compile-per-call (no cache by design)
- random: OsRng only; bytes/string capped to prevent script-side blow-up
- time: UTC, ms-since-epoch as canonical i64; RFC 3339 strings for I/O
- json: parse/stringify via existing dynamic<->json bridge
- base64: standard + URL-safe alphabets, Blob and String inputs
- hex: lowercase output, case-insensitive decode
- url: RFC 3986 percent-encoding + encode_query for Maps
Stdlib registration runs unconditionally — including in the parse-only
validate path — so scripts get a uniform surface in both phases.
See docs/sdk-shape.md for the stateless-vs-stateful distinction.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
