Add a regular expression benchmark

benchmarks/regex/Dockerfile

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+FROM rust:1.67
+
+RUN rustup target add wasm32-wasi
+WORKDIR /usr/src
+ADD rust-benchmark rust-benchmark
+WORKDIR /usr/src/rust-benchmark
+RUN cargo build --release --target wasm32-wasi
+RUN cp target/wasm32-wasi/release/regex-wasm-benchmark.wasm /benchmark.wasm
+# We output the Wasm file to /benchmark.wasm, where the client expects it.

benchmarks/regex/README.md

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+This regular expression benchmark measures the time taken to match e-mails,
+URIs, and IP addresses in an input text. It is written in Rust and can be
+re-compiled using the `Dockerfile` (see [`build.sh`]).
+
+It is significantly adapted from the [regex-benchmark] project, which is [MIT]
+licensed. The [`default.input`] text is a concatenation of [Learn X in Y
+minutes] which is published under the [Creative Commons Attribution-ShareAlike
+3.0 Unported] license.
+
+[`build.sh`]: ../build.sh
+[regex-benchmark]: https://github.com/mariomka/regex-benchmark
+[MIT]: https://github.com/mariomka/regex-benchmark/blob/master/LICENSE
+[`default.input`]: ./default.input
+[Learn X in Y minutes]: https://github.com/adambard/learnxinyminutes-docs
+[Creative Commons Attribution-ShareAlike 3.0 Unported]: http://creativecommons.org/licenses/by-sa/3.0/deed.en_US