naive_opt

The optimized naive string-search algorithm.

Features

The naive string-searching algorithm
Enhanced with 1-byte search like the libc++ and the libstd++ string::find
Specializing in UTF-8 strings, which is a feature of rust
Support the zero overhead trait.
minimum support: rustc 1.41.1 (f3e1a954d 2020-02-24)

Compatibility

This crate is implemented to replace the rust std library. However, the method names are different, so please rewrite your code. It shouldn't be too difficult.

compatibility:

rust `std::str`	this crate
`std::str::find()`	`naive_opt::Search::search()`
`std::str::rfind()`	`naive_opt::Search::rsearch()`
`std::str::contains()`	`naive_opt::Search::includes()`
`std::str::match_indices()`	`naive_opt::Search::search_indices()`
`std::str::rmatch_indices()`	`naive_opt::Search::rsearch_indices()`

Examples

Example function:

use naive_opt::{string_search, string_rsearch};
use naive_opt::{string_search_indices, string_rsearch_indices};

let haystack = "111 a 111b";
let needle = "a";
let r = string_search(haystack, needle);
assert_eq!(r, Some(4));

assert_eq!(string_search(haystack, "1"), Some(0));
assert_eq!(string_rsearch(haystack, "1"), Some(8));

let v: Vec<_> = string_search_indices("abc345abc901abc", "abc").collect();
assert_eq!(v, [(0, "abc"), (6, "abc"), (12, "abc")]);
let v: Vec<_> = string_rsearch_indices("abc345abc901abc", "abc").collect();
assert_eq!(v, [(12, "abc"), (6, "abc"), (0, "abc")]);

Example trait: Search

use naive_opt::Search;

let haystack = "111 a 111b";
let needle = "a";
let r = haystack.search(needle);
assert_eq!(r, Some(4));

assert_eq!(haystack.search("1"), Some(0));
assert_eq!(haystack.rsearch("1"), Some(8));

let v: Vec<_> = "abc345abc901abc".search_indices("abc").collect();
assert_eq!(v, [(0, "abc"), (6, "abc"), (12, "abc")]);
let v: Vec<_> = "abc345abc901abc".rsearch_indices("abc").collect();
assert_eq!(v, [(12, "abc"), (6, "abc"), (0, "abc")]);

Example trait: SearchIn

use naive_opt::SearchIn;

let haystack = "111 a 111b";
let needle = "a";
let r = needle.search_in(haystack);
assert_eq!(r, Some(4));

assert_eq!("1".search_in(haystack), Some(0));
assert_eq!("1".rsearch_in(haystack), Some(8));

Benchmark

`name`	`bench:en`	`bench:ja`	`musl:en`	`musl:ja`
std_str_str	445.560 uc	355.440 uc	458.540 uc	359.400 uc
std_string_string	450.900 uc	355.110 uc	453.940 uc	354.490 uc
func_str_str	57.928 uc	56.888 uc	59.602 uc	59.365 uc
func_string_string	56.754 uc	56.721 uc	59.276 uc	59.016 uc
trait_str_str	50.825 uc	49.719 uc	52.659 uc	52.919 uc
trait_string_string	49.898 uc	49.951 uc	52.263 uc	52.721 uc
std_indices	349.200 uc	269.560 uc	373.310 uc	267.570 uc
func_indices	51.955 uc	52.269 uc	55.074 uc	54.534 uc
trait_indices	52.235 uc	52.201 uc	54.549 uc	54.589 uc

std is std::str::find()
us is micro seconds
:en is english haystack.
:ja is japanese haystack.
musl is x86_64-unknown-linux-musl
compile by rustc 1.50.0 (cb75ad5db 2021-02-10)
bench on intel Q6600 @ 2.40GHz

Changelogs

This crate's changelog here.

naive_opt 0.1.8