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‎.github/workflows/test.yml‎

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name: Test
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on: [pull_request]
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concurrency:
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group: test-${{ github.event.pull_request.number || github.ref }}
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cancel-in-progress: true
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jobs:
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test:
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strategy:
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matrix:
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go-version: [1.19.x]
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platform: [ubuntu-latest, macos-latest, windows-latest]
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runs-on: ${{ matrix.platform }}
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steps:
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- name: Install Go
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uses: actions/setup-go@v3
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with:
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go-version: ${{ matrix.go-version }}
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- name: Checkout code
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uses: actions/checkout@v3
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- name: Test
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if: ${{ matrix.platform != 'ubuntu-latest' }}
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run: go test ./...
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- name: Test
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if: ${{ matrix.platform == 'ubuntu-latest' }}
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run: go test -race ./...

‎.gitignore‎

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# Compiled Object files, Static and Dynamic libs (Shared Objects)
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*.o
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*.a
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*.so
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# Compiled binaries
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_example/_example
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# Folders
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_obj
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_test
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# Architecture specific extensions/prefixes
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*.[568vq]
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[568vq].out
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*.cgo1.go
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*.cgo2.c
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_cgo_defun.c
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_cgo_gotypes.go
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_cgo_export.*
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_testmain.go
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*.exe
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*.test
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*.prof
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# Tpc-h tbl files
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benchmark/*tbl
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vendor
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Makefile.main
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.ci/
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_example/main
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_example/*.exe
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test-server
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.idea/*
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/.vscode/
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# OSX Files
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.DS_Store

‎LICENSE‎

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Apache License
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‎README.md‎

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# ICU Regular Expressions in Go
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The [ICU library](https://github.com/unicode-org/icu) is used in MySQL to parse regular expressions.
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Go's built-in regular expressions follow a different standard than ICU, and thus can cause inconsistencies when attempting to match MySQL's behavior.
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These inconsistencies would hopefully result in an error (prompting user intervention), but may silently return unexpected results, raising no alarm when data is being modified in unexpected ways.
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To get around this, we've implemented the necessary ICU functions by compiling them into a [WebAssembly](https://webassembly.org/) module, and running the module using the [wazero](https://github.com/tetratelabs/wazero) library.
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Although this approach does come with a performance penalty, this allows for implementing packages to retain cross-compilation support, as CGo is not invoked due to this package.
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## Building
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To make modifications to the compiled WASM module, we've included a [build script](icu/build.sh).
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The requirements are as follows:
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* Emscripten v3.1.38
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* wasm2wat
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* wat2wasm
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Other Emscripten versions may compile just fine, however they have not been tested, and thus we restrict compilation to only the tested version.
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This also means that the ICU library is version [68.1](https://github.com/unicode-org/icu/tree/5d81f6f9a0edc47892a1d2af7024f835b47deb82), as that is the only version that our supported version of Emscripten has ported.
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Both `wasm2wat` and `wat2wasm` exist to expose the global stack variable, as not all platforms will expose the variable.
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None of the exposed functions require [ICU's data](https://unicode-org.github.io/icu/userguide/icu_data/), thus it has been excluded to save on space and memory usage.
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MySQL, although collation aware (and in spite of what the documentation may suggest), does not make use of any collation functionality in the context of regular expressions.
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## Notes
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Due to the high startup-cost of the WASM runtime, this package _enforces_ that all Regex objects are closed before being dereferenced.
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If any Regex objects are dereferenced before being closed, then a panic will occur at some non-deterministic point in the future.

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