concept.md is the full design document: the objective (Python re parity
plus binary/ASCII/UTF-8 modes, gigabyte-scale input, single C file), the
automata-theory argument for why unrestricted backreferences/lookaround
are incompatible with strict single-pass constant memory, the resulting
two-engine architecture, the exact Python-mirroring naming convention,
and a full comparison against POSIX regex.h for C-background readers.
regexx.c/regexx.h are the v1 implementation: parser, compiler to a
Pike/backtracking-style bytecode, and a single recursive backtracking
engine covering the pattern syntax and operations listed in README.md,
validated against CPython's own re module output (tests/), clean under
AddressSanitizer/UBSan, and stress-tested (50MB simple-quantifier match,
graceful failure rather than a crash on complex repeats over large
input, clean rejection of every intentionally unsupported construct).
Also included: examples/rxgrep.c (a small grep-like program exercising
all three data modes and the substitution API), the Makefile, the MIT
LICENSE, and docs/API.md, an exhaustive reference for every type, flag,
and function's exact return-value and memory-ownership convention,
checked against the current source and against a real CPython
interpreter rather than against memory.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EjuMk8kY9SDus1wWe2K9xY
retoorandClaude Sonnet 5
8f6afd6cd4