Nope. ripgrep uses the `memchr` crate for substring search, and in my benchmarks it's generally faster than stringzilla:

    $ rebar cmp results.csv --intersection -f huge
    benchmark                                        rust/memchr/memmem/prebuilt  stringzilla/memmem/oneshot
    ---------                                        ---------------------------  --------------------------
    memmem/pathological/md5-huge-no-hash             47.4 GB/s (1.00x)            38.1 GB/s (1.25x)
    memmem/pathological/md5-huge-last-hash           40.3 GB/s (1.00x)            23.4 GB/s (1.72x)
    memmem/pathological/rare-repeated-huge-tricky    40.4 GB/s (1.04x)            42.0 GB/s (1.00x)
    memmem/pathological/rare-repeated-huge-match     1977.7 MB/s (1.00x)          563.3 MB/s (3.51x)
    memmem/subtitles/common/huge-en-that             35.9 GB/s (1.00x)            25.3 GB/s (1.42x)
    memmem/subtitles/common/huge-en-you              15.9 GB/s (1.00x)            9.5 GB/s (1.67x)
    memmem/subtitles/common/huge-en-one-space        1376.4 MB/s (1.00x)          1364.0 MB/s (1.01x)
    memmem/subtitles/common/huge-ru-that             29.0 GB/s (1.00x)            15.5 GB/s (1.87x)
    memmem/subtitles/common/huge-ru-not              16.0 GB/s (1.00x)            3.5 GB/s (4.53x)
    memmem/subtitles/common/huge-ru-one-space        2.6 GB/s (1.00x)             2.4 GB/s (1.08x)
    memmem/subtitles/common/huge-zh-that             31.2 GB/s (1.00x)            23.8 GB/s (1.31x)
    memmem/subtitles/common/huge-zh-do-not           19.4 GB/s (1.00x)            12.1 GB/s (1.59x)
    memmem/subtitles/common/huge-zh-one-space        5.3 GB/s (1.05x)             5.6 GB/s (1.00x)
    memmem/subtitles/never/huge-en-john-watson       41.2 GB/s (1.00x)            31.2 GB/s (1.32x)
    memmem/subtitles/never/huge-en-all-common-bytes  47.9 GB/s (1.00x)            37.5 GB/s (1.28x)
    memmem/subtitles/never/huge-en-some-rare-bytes   43.4 GB/s (1.00x)            42.7 GB/s (1.02x)
    memmem/subtitles/never/huge-en-two-space         42.2 GB/s (1.00x)            30.7 GB/s (1.37x)
    memmem/subtitles/never/huge-ru-john-watson       42.2 GB/s (1.00x)            42.1 GB/s (1.00x)
    memmem/subtitles/never/huge-zh-john-watson       47.6 GB/s (1.00x)            34.0 GB/s (1.40x)
    memmem/subtitles/rare/huge-en-sherlock-holmes    40.8 GB/s (1.05x)            42.9 GB/s (1.00x)
    memmem/subtitles/rare/huge-en-sherlock           36.7 GB/s (1.16x)            42.5 GB/s (1.00x)
    memmem/subtitles/rare/huge-en-medium-needle      47.7 GB/s (1.00x)            31.3 GB/s (1.52x)
    memmem/subtitles/rare/huge-en-long-needle        44.5 GB/s (1.00x)            32.0 GB/s (1.39x)
    memmem/subtitles/rare/huge-en-huge-needle        45.7 GB/s (1.00x)            33.4 GB/s (1.37x)
    memmem/subtitles/rare/huge-ru-sherlock-holmes    42.1 GB/s (1.00x)            42.2 GB/s (1.00x)
    memmem/subtitles/rare/huge-ru-sherlock           42.3 GB/s (1.01x)            42.9 GB/s (1.00x)
    memmem/subtitles/rare/huge-zh-sherlock-holmes    46.7 GB/s (1.00x)            33.1 GB/s (1.41x)
    memmem/subtitles/rare/huge-zh-sherlock           47.4 GB/s (1.00x)            42.8 GB/s (1.11x)

But I would say they are overall pretty competitive.

If you want to run the benchmarks yourself, you can. First, get rebar[1]. Then, from the root of the `memchr` repository[2]:

    $ rebar build -e 'rust/memchr/memmem/prebuilt' -e 'stringzilla/memmem/oneshot'
    stringzilla/memmem/oneshot: running: cd "benchmarks/./engines/stringzilla" && "cargo" "build" "--release"
    stringzilla/memmem/oneshot: build complete for version 3.12.3
    rust/memchr/memmem/prebuilt: running: cd "benchmarks/./engines/rust-memchr" && "cargo" "build" "--release"
    rust/memchr/memmem/prebuilt: build complete for version 2.7.4
    $ rebar measure -e 'rust/memchr/memmem/prebuilt' -e 'stringzilla/memmem/oneshot' | tee results.csv
    $ rebar rank results.csv
    Engine                       Version  Geometric mean of speed ratios  Benchmark count
    ------                       -------  ------------------------------  ---------------
    rust/memchr/memmem/prebuilt  2.7.4    1.14                            57
    stringzilla/memmem/oneshot   3.12.3   1.43                            54
    $ rebar cmp results.csv --intersection -f never/huge
    benchmark                                        rust/memchr/memmem/prebuilt  stringzilla/memmem/oneshot
    ---------                                        ---------------------------  --------------------------
    memmem/subtitles/never/huge-en-john-watson       41.2 GB/s (1.00x)            31.2 GB/s (1.32x)
    memmem/subtitles/never/huge-en-all-common-bytes  47.9 GB/s (1.00x)            37.5 GB/s (1.28x)
    memmem/subtitles/never/huge-en-some-rare-bytes   43.4 GB/s (1.00x)            42.7 GB/s (1.02x)
    memmem/subtitles/never/huge-en-two-space         42.2 GB/s (1.00x)            30.7 GB/s (1.37x)
    memmem/subtitles/never/huge-ru-john-watson       42.2 GB/s (1.00x)            42.1 GB/s (1.00x)
    memmem/subtitles/never/huge-zh-john-watson       47.6 GB/s (1.00x)            34.0 GB/s (1.40x)

[1]: https://github.com/BurntSushi/rebar

[2]: https://github.com/BurntSushi/memchr

Processing Strings 109x Faster Than Nvidia on H100