27 lines
1.3 KiB
Markdown
27 lines
1.3 KiB
Markdown
# .NET regex engine
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This is a fixed `[JSExport]` bridge over .NET 10.0.10
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`System.Text.RegularExpressions`, built with SDK 10.0.302 for `browser-wasm`.
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It always applies `RegexOptions.CultureInvariant` for deterministic local
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results. Native match positions are UTF-16 offsets. The project uses
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WebAssembly library mode because its `[JSExport]` methods are hosted directly
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inside a module worker and do not require an executable entry point.
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The bridge receives one JSON value and never evaluates user input as managed or
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JavaScript source. A nine-second native regex timeout complements the app's
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shorter killable-worker deadline. Match, capture-row, pattern, subject and
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replacement-output limits are enforced in managed code as a second boundary.
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Replacement templates are parsed once by a fixed streaming implementation of
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.NET's `$$`, numbered/named-group, whole-match, left/right-context, last-group
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and whole-input tokens. Engine startup compares that implementation with
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native `Match.Result` on a parity corpus. Successful output crosses the JS
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export as bounded UTF-8 bytes in canonical base64, avoiding unbounded
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intermediate replacement strings and JSON escaping amplification.
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Build from the pinned SDK plus `wasm-tools` workload:
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```sh
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/absolute/path/to/dotnet publish engines/dotnet/RegexTools.DotNet.csproj \
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--configuration Release
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```
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