A curated collection of awesome Regex libraries, tools, frameworks and software. The goal is to build a categorized community-driven collection of very well-known resources.

Inspired by awesome-dotnet, awesome-ruby, awesome-awesomeness and the whole awesome-* trend on GitHub. Thank you Reddit, HackerNews and StackOverflow for the help.

Sharing, suggestions and contributions are always welcome! Please take a look at the contribution guidelines and quality standard first. Thanks to all contributors, you're awesome and wouldn't be possible without you!

• Documentation
• Prototyping and Test
• Generator
• Learning
• Library
• Collections
• Explanation
• Exercise
• Articles
• Books
• Benchmarks

• Regular Expression Language - Quick Reference - MSDN documentation about Regex
• Regular Expressions - MDN chapter about JavaScript regular expressions
• Perl Regular Expression Syntax - Boost documentation
• Perl 6 - Regexes in Perl 6
• PCRE - Concatenated PCRE man pages
• ECMAScript 6 - New Regexes in ECMAScript 6
• regex header in C++ - <regex> in C++
• class Pattern in Java - Java 7 docs
• class Regex in Scala - Scala Regex
• Python re module - Regular Expressions Python module tutorial

• Debuggex - An online visual regex tester
• RegExr - A website for interactive regex prototyping with syntax highlighting (by @gskinner)
• Regex101 - An online regex tester, debugger with highlighting
• Rubular - A Ruby-based regular expression editor and tester
• Rex V - An AJAX Regular EXpression eValuator
• RegViz - A tool for debugging JavaScript regular expressions in a visual way
• Regulex - A JavaScript Regular Expression Visualizer
• PyRegex - An online regex tester to check validity of regexp in the Python language regex subset
• pythex - A quick way to test your Python regular expressions
• Regexper - A regex visualizer for JavaScript using railroad diagrams
• HiFi Regex Tester - Live JavaScript Regular Expression Tester
• Regex Hero - .NET online regex tester
• Regex Storm - A .NET regex tester with highlighting and detailed results output
• RegexPal - JavaScript + PCRE online tester
• RegexTester - Regular Expression Tester with highlighting for Javascript and PCRE.
• Free Formatter - Free online regex tester
• Regex Tester - Golang - A secure regular expression tester built using Go

• Txt2Re - Generate Regular expressions based on a string
• Regex Generator++ - An Automatic Generation of Text Extraction Patterns from Examples
• regexgen - Generates regular expressions that match a set of strings.
• RegexGenerator - A tool for generating regular expressions for text extraction (by @MaLeLabTs)
• Gamon's numberic range generator - Regex Numeric Range Generator, when you need to match an integer range.
• rgxg - Command line tool to generate regex

• Wikipedia - Entry on regular expressions
• Learn Regex The Hard Way - An in-progress book that quickly teaches you regular expressions.
• Regular Expression Matching Can Be Simple And Fast - Basic concept of how RegEx parsing works
• [PDF] A Tao Of Regular Expressions - What are Regular Expressions
• Regular-Expressions.info - An informative website for learning regular expressions
• RexEgg - A regular expressions tutorial that goes deep into advanced features
• Try Regex - Try Regex is an interactive regular expressions tutorial
• Udemy - A Basic Introduction To Using Regular Expressions In Programming
• Codecademy - How to use of regular expression
• Regex golf - Regex golf with Peter Norvig
• Python Regular Expressions - A good introduction to Python Regular Expressions from Google
• /Reg(exp){2}lained/: Demystifying Regular Expressions - Fluent 2012 talk reviewing and visualizing basic and intermediate Regular Expressions.
• Regular Expressions - Everything you should know - PDF Series
• The Java Tutorials
• Regex Syntax Summary
• How Regexes work
• Learn Regular Expressions for Beginners
• Java Regex- Tutorial
• Javascript.info - Regular expressions - Regular expressions section in The Modern JavaScript Tutorial
• Useful Regexes
• Teach Yourself Regular Expressions

• Tre - Free and portable approximate regex matching library
• Go-Restructure - Match regular expressions into struct fields in Go (by @alexflint) js C#
• js-regex - Chainable API for construting Regexes
• VerbalExpressions - VerbalExpressions is a cross-language library that helps to construct difficult regular expressions.
• XRegExp] - JavaScript regex library
• RE2 - RE2 is a fast, safe, thread-friendly alternative to backtracking regular expression engines like those used in PCRE, Perl, and Python. It is a C++ library.
• Hyperscan - High-performance multiple regex matching library.

• RegExLib - Regular Expression Library (5000+ indexed expressions)
• regexhub - Useful Regex Patterns

• RegexTranslator - A web app to decode regex into plain English. You can edit it and translate back
• Explain.pl - Explain Regular Expressions

• HackerRank Regex Challenges - Regex challenges with varying levels of difficulty.
• Redoku - Little Regex Sudoku/Crossword thing (by @padolsey)
• Regex Tuesday - Challenges - Challenge list about Regex
• Regex Crossword - A crossword puzzle game using regular expressions
• RegexOne - Learn regular expressions with simple, interactive examples
• Regexp Exercises - Regexp exercises
• Regular Expression Crossword Puzzle - A crossword puzzle with a neat web interface.

• 5 Techniques to Improve Regex Performance - Craft your own powerful, yet efficient regex
• The Bad, the Better, and the Best - How a few characters can make a difference in performance
• The Greatest Regex Trick Ever - So you're doubtful at the mention of a "best regex trick"?
• Treat regular expressions as code, not magic - If you don’t write them carefully, you can end up with an unmaintainable monstrosity
• Demystifying The Regular Expression That Checks If A Number Is Prime - How a regular expression can check if a number is prime
• RegExp Tree: a regular expressions processor
• The thirty minute regex tutorial - Regular Expressions in 30 Minutes
• Regular Expression Matching Can Be Simple And Fast
• Regular Expressions in a post ES6 World
• Regular expression (regex) performance: The fundamental guide
• The New ‘Absent Operator’ in Ruby’s Regular Expressions
• Optimizing regexes in Java
• Use RegEx to Test Password Strength in JavaScript
• Java 101 - Regular Expressions in Java
• Most Crazy Regexes - Stack Overflow
• Regex Humor - Regex jokes and cartoons
• The true power of regular expressions

• Patterns, Automata, and Regular Expressions - Al Aho and Jeff Ullman (1992) (chapter 10 of Foundations of Computer Science)
• Beginning Regular Expressions - Andrew Watt (2005)
• Mastering Regular Expressions - Jeffrey E.F. Friedl (2006)
• Regular Expression Pocket Reference - Tony Stubblebine (2007)
• Introducing Regular Expressions - Michael Fitzgerald (2012)
• Regular Expressions Cookbook - Jan Goyvaerts & Steven Levithan (2012)
• Mastering Python Regular Expressions - Felix Lopez & Victor Romero (2014)
• JavaScript Regular Expressions - Loiane Groner & Gabriel Manricks (2015)
• Regex - the complete tutorial

• Benchmark of Regex Libraries
• Java regular expression library benchmarks – 2015
• Languages Regex Benchmark - It's just a simple regex benchmark of different programming languages.
• Performance comparison of regular expression engines
• Regex Performance - Performance comparison of regular expression engines.

• Regular Expressions Cheat Sheet
• Regex Cheat Sheet
• MIT Cheat Sheet
• Java Cheat Sheet
• JavaScript Cheat Sheet

Other amazingly awesome lists can be found in the awesome-awesomeness list, the awesome list or if you want more lists.