Pcre2 zig14

[pdx-daniel]

Pull Request: PCRE v1 → PCRE2 Migration with Zig 0.14+ Support

Overview

Migrates FastFEC from end-of-life PCRE v1 to PCRE2 while adding Zig 0.14+ support and cleaning up the build system.

Why This Change

• Homebrew Compatibility: PCRE v1 is EOL, PCRE2 is required for modern distros
• Zig Modernization: Support current Zig versions (≥0.14)
• Build Simplification: Remove unnecessary complexity while maintaining functionality

What Changed

• Added PCRE2: Vendored PCRE2 10.42 source tree in src/pcre2/
• Thin Wrapper: Created src/regex.h and src/regex.c to maintain API compatibility
• Build Updates: Modernized build.zig for Zig 0.14+ with flexible PCRE2 linking
• Removed Legacy: Deleted old PCRE v1 source tree

Key Features

• Zero Breaking Changes: All existing code works unchanged
• Flexible Linking: -Dvendored-pcre option (defaults to true)
• Cross-Platform: Works on macOS, Linux, Windows, WASM
• Performance: Maintained ~11.89 MB/s processing speed

Test Results

• C Tests: 21/21 passing
• Python Tests: 8/8 passing
• All Build Targets: Working across platforms
• Performance: No regression in benchmark tests

Build Options

# Default (vendored PCRE2)
zig build

# System PCRE2 (for package maintainers)
zig build -Dvendored-pcre=false

# WASM build
zig build -Dwasm=true

Files Changed

• 91 files changed: 41,021 insertions(+), 66,819 deletions(-)
• Major additions: PCRE2 source tree, regex wrapper
• Major removals: Legacy PCRE v1, build complexity

Ready for merge ✅ - All tests passing, no breaking changes.