DFA regular expression library & friends

automata regexes fsm compiler regex regexp lex finite-state-machine lexer lexical-analysis compilers lexing compiler-principles lexer-generator nfa regex-validator finite-state-automata finite-state-machines dfa

• Updated Nov 12, 2026
• C

Cheatsheet for different regex syntaxes

regexes regular-expression cheatsheet

• Updated Dec 18, 2024
• HTML

JavaScript library for working with automata and grammars for regular and context-free languages

javascript computer-science automata grammars fsms regexes finite-state-machine regular-expressions educational-software

• Updated Aug 22, 2024
• JavaScript

Maintainable regular expressions for TypeScript and JavaScript.

javascript regexes typescript regex regular-expressions

• Updated Feb 10, 2025
• TypeScript

🦑 An Elixir regular expression editor & tester, with Elm

regexes elixir web elm

• Updated Jan 12, 2020
• Elm

Easily compose regular expressions without the need for double-escaping inside strings.

javascript regexes es6 regex regexp regular-expression template-string regex-util regex-engine regexr hand-picked-regexes

• Updated Feb 21, 2024
• TypeScript

non-backtracking NFA-based regular expression library, for C and Python

parser regexes patterns parsing compiler pattern-matching regex regexp compilers regex-pattern nfa hacktoberfest parsers compiler-design

• Updated Oct 4, 2020
• C

A lightweight and powerful PHP package for any Persian regex

php regexes laravel php7 regex persian validation-library

• Updated May 21, 2025
• PHP

A Swift PEG parser

swift grammars regexes grammar regular-expression parsing-expression-grammar peg regexps parsing-expression-grammars peg-parser

• Updated Aug 11, 2022
• Swift

Cross-platform regex file searching tool in .NET 5

linux regexes dotnet regex cross-platform-gui eto regular-expressions file-search net5

• Updated Sep 3, 2024
• C#

Cross-platform regex testing tool in .NET 5

linux regexes dotnet test regex cross-platform-gui eto regular-expressions net5

• Updated Sep 3, 2024
• C#

A Rocq Mechanization of ECMAScript 2023 Regexes

javascript regexes coq test262 regularexpressions mechanization

• Updated Nov 10, 2026
• OCaml

Go package with more powerful, flexible, and safe API for regular expressions based on lazy iterators

go golang regexes regex regexp iterator iterators regexpes

• Updated Apr 14, 2025
• Go

A little Clojure library that provides regex-based file grepping and/or text substitution.

files regexes clojure clojure-library grep text-substitution

• Updated Mar 18, 2026
• Clojure

fail2ban configuration files for filtering bad strongSwan authentication attempts; Regexes are based on RSA + XAUTH and RSA/EAP-TLS login schemes.

regexes fail2ban strongswan

• Updated May 14, 2020

Provides the best regex for validating or extracting URLs

ruby ruby-gem regexes rubygem parsing extract-urls

• Updated Apr 9, 2021
• Ruby

Ping file system events to any API

python regexes python3 watchman filewatcher yaml-configuration path-watchman

• Updated Dec 7, 2016
• Python

Perl compatible regular expressions for JavaScript

regexes regex webassembly wasm pcre pcre2

• Updated Sep 20, 2020
• JavaScript

Regular expression tools for .NET developers

regexes pattern-matching regex regexp regular-expression regular-expressions

• Updated Oct 17, 2026
• C#

Regular expression tools for Kotlin developers

kotlin regexes pattern-matching regex regexp regular-expression kotlin-library regular-expressions

• Updated Oct 24, 2026
• Kotlin