# AhoCorasickDoubleArrayTrie

**Repository Path**: mirrors_toolgood/AhoCorasickDoubleArrayTrie

## Basic Information

- **Project Name**: AhoCorasickDoubleArrayTrie
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2021-10-22
- **Last Updated**: 2026-03-22

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# NReco.Text.AhoCorasickDoubleArrayTrie
Very fast C# implementation of Aho Corasick algorithm based on Double Array Trie: efficient text search of many substrings with O(n) complexity.

NuGet | Ubuntu 14.04
--- | ---
[![NuGet Release](https://img.shields.io/nuget/v/NReco.Text.AhoCorasickDoubleArrayTrie.svg)](https://www.nuget.org/packages/NReco.Text.AhoCorasickDoubleArrayTrie/) | [![Travis CI](https://img.shields.io/travis/nreco/AhoCorasickDoubleArrayTrie/master.svg)](https://travis-ci.org/nreco/AhoCorasickDoubleArrayTrie) 

* very fast: can be used for efficient substring search of thousands keywords with O(n) complexity.
* trie represented with double array approach to minimize memory usage
* automata state can be effectively saved/loaded to binary stream (say, file)
* supports case-insensitive search

## How to use
```
// note: keywords may be provided as enumeration of KeyValuePair
var keywords = new Dictionary<string,int>() {
  {"are", 1},
  {"is", 1},
  {"he", 2},
  {"she", 2},
  {"it", 2},
  {"we", 2}
};
var matcher = new AhoCorasickDoubleArrayTrie<int>( keywords );
var text = "we are all champions";
matcher.ParseText(text, (hit) => {
	Console.WriteLine("Matched: {0} = {1}", text.Substring(hit.Begin, hit.Length), hit.Value );
});
```

## License
Licensed under the Apache License, Version 2.0 (see LICENSE file).

This C# implementation is a port of hankcs's https://github.com/hankcs/AhoCorasickDoubleArrayTrie (java) that were licensed under the Apache 2.0 License (see http://www.apache.org/licenses/LICENSE-2.0).
Copyright 2017-2019 Vitaliy Fedorchenko (port to C#, improvements) and contributors