Top 9 regex-engine Open-Source Projects

regex

91 3,345 9.1 Rust

An implementation of regular expressions for Rust. This implementation uses finite automata and guarantees linear time matching on all inputs.

Project mention: Zed is now open source | news.ycombinator.com | 2024-01-24

The homepage has a benchmark that compares Zed's "insertion latency" to other editors, and this is the description:
> Open input.rs at the end of line 21 in rust-lang/regex. Type z 10 times, measure how long it takes for each z to display since hitting the z key.
Could someone clarify what that means? My interpretation of that was to go to https://github.com/rust-lang/regex/blob/master/regex-cli/arg... and start typing 'z' at the end of line 21, but that doesn't seem to make any sense. I guess that repo got refactored and those instructions are out of date?

regexp2

4 925 2.9 Go

A full-featured regex engine in pure Go based on the .NET engine

Project mention: Best regexp alternative for Go. Benchmarks. Plots. | dev.to | 2023-08-26

regexp2 (1.10.0) - a feature-rich regexp engine for Go. It does not have runtime guarantees like the built-in regexp package, but is compatible with Perl5 and .NET;

InfluxDB

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RE-flex

3 484 7.4 C++

A high-performance C++ regex library and lexical analyzer generator with Unicode support. Extends Flex++ with Unicode support, indent/dedent anchors, lazy quantifiers, functions for lex and syntax error reporting and more. Seamlessly integrates with Bison and other parsers. (by Genivia)

Project mention: RE/flex 3.3.4 released - a scanner generator for C++ | /r/Compilers | 2023-05-31

zig-regex

1 149 7.1 Zig

A regex implementation for the zig programming language

Project mention: Zig regex library | /r/Zig | 2023-09-23

I've been building a personal grep clone and using this package as a learning guide to get familiar with Zig. This may be a useful reference: https://github.com/tiehuis/zig-regex

re2js

1 91 9.0 JavaScript

RE2JS is the JavaScript port of RE2, a regular expression engine that provides linear time matching

Project mention: RE2JS is the JavaScript port of RE2 | news.ycombinator.com | 2023-07-14

clex

9 87 3.0 C

clex is a simple lexer generator
re2

1 26 3.8 C++

R interface to Google re2 (C++) regular expression engine (by girishji)
WorkOS

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pcre

1 10 5.9 Go

Pure-Go port of the PCRE2 regular expression engine.
reng

1 5 3.6 Java

Simple toy regex engine implemented using backtracking algorithm and continuations.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).