# PCRE2 engine bridge

This directory contains the GPL-3.0-or-later application bridge and
deterministic build description for the bundled PCRE2 flavour. It deliberately
does not vendor the upstream PCRE2 source tree or generated binaries.

ABI version 3 exposes:

- exact engine identity and configuration;
- compile diagnostics with UTF-8 byte offsets;
- bounded non-overlapping matching with copied group-zero/capture records and
  copied capture-name metadata;
- bounded native `pcre2_substitute()` semantics over the same retained match
  sequence;
- bounded automatic-callout tracing from one native `pcre2_match()` invocation,
  with copied event and mark data and an immediate native stop at either trace
  cap;
- match-step, depth, heap, match-count, capture-row and output limits;
- no native pointer or compiled-code handle across a call boundary.

All PCRE2 allocations are released before an ABI call returns. JavaScript owns
and frees every input/result buffer in `finally`, and the containing worker is
terminated on timeout, crash, cancellation or supersession.

The explicit offline source/toolchain identity, build, verification and local
asset-install workflow is documented in
[`docs/ENGINE_BUILDS.md`](../../docs/ENGINE_BUILDS.md).