A library for finding occurrences of many patterns at once. This library provides multiple pattern search principally through an implementation of the Aho-Corasick algorithm, which builds a fast finite state machine for executing searches in linear time. Features include case insensitive matching, overlapping matches and search & replace in streams.
Dual-licensed under MIT or the UNLICENSE.
Add this to your Cargo.toml:
[dependencies]
aho-corasick = "0.7"and this to your crate root (if you're using Rust 2015):
extern crate aho_corasick;This example shows how to search for occurrences of multiple patterns simultaneously. Each match includes the pattern that matched along with the byte offsets of the match.
use aho_corasick::AhoCorasick;
let patterns = &["apple", "maple", "Snapple"];
let haystack = "Nobody likes maple in their apple flavored Snapple.";
let ac = AhoCorasick::new(patterns);
let mut matches = vec![];
for mat in ac.find_iter(haystack) {
matches.push((mat.pattern(), mat.start(), mat.end()));
}
assert_eq!(matches, vec![
(1, 13, 18),
(0, 28, 33),
(2, 43, 50),
]);This is like the previous example, but matches Snapple case insensitively
using AhoCorasickBuilder:
use aho_corasick::AhoCorasickBuilder;
let patterns = &["apple", "maple", "snapple"];
let haystack = "Nobody likes maple in their apple flavored Snapple.";
let ac = AhoCorasickBuilder::new()
.ascii_case_insensitive(true)
.build(patterns);
let mut matches = vec![];
for mat in ac.find_iter(haystack) {
matches.push((mat.pattern(), mat.start(), mat.end()));
}
assert_eq!(matches, vec![
(1, 13, 18),
(0, 28, 33),
(2, 43, 50),
]);