26 lines
1.3 KiB
Markdown
26 lines
1.3 KiB
Markdown
# Rust regex WebAssembly engine
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This directory builds the actual Rust `regex` crate 1.13.1 for
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`wasm32-unknown-unknown` with Rust 1.97.1 and wasm-bindgen 0.2.126.
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The fixed bridge accepts JSON values only. The adapter measures the exact
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encoded request size, and the native cap includes JSON's worst-case sixfold
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escaping for every accepted string field. It exposes native UTF-8 byte offsets,
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capture names, iteration, and `Captures::expand` replacement syntax. It does
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not evaluate user values as Rust or JavaScript source.
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Replacement uses a bounded streaming implementation of
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`Captures::expand` grammar. Load-time differential fixtures compare it with
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the native API, and capture references stop expanding as soon as the UTF-8
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output cap is reached.
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The bounded bytes cross the JSON bridge as base64, so control-heavy output has
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a fixed 4:3 transport expansion instead of JSON's content-dependent escaping.
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Flags `i`, `m`, `s`, `U`, `x`, and `R` map directly to `RegexBuilder`.
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Unicode is the crate's native default; the accepted `u` flag explicitly
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affirms that default. `g` selects the crate's native iterator.
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The crate deliberately excludes look-around and backreferences. Compile-size,
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DFA-cache, pattern, subject, match, capture-row, and output limits are enforced
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inside the module. Replacement output is clipped only at a UTF-8 boundary.
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