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awesome-regex

A curated collection of awesome regex tools, tutorials, libraries, etc.
https://github.com/slevithan/awesome-regex

Last synced: 5 days ago
JSON representation

Grep-like tools
- Command line
  - ripgrep - Better and faster grep. Recursively searches directories while respecting gitignore rules and skipping hidden/binary files.
  - Feature comparison of grep-like tools
- GUI
  - PowerRename - regex/raw/main/media/windows.svg" title="Windows" height="13"></picture>) - Rename files using regexes.
  - Aba Search and Replace - regex/raw/main/media/windows.svg" title="Windows" height="13"></picture>, $30) - Displays matches as you type.
  - PowerGREP - regex/raw/main/media/windows.svg" title="Windows" height="13"></picture>, $159) - Can search through archives, binary files, PDFs, docs/sheets, emails, etc., via its GUI or the command line.
  - RegexRenamer - regex/raw/main/media/windows.svg" title="Windows" height="13"></picture>) - Rename files using regexes.
Regex engines
- Source code
  - Boost.Regex - Popular C++ regex library.
  - Hyperscan - Intel's high-performance library, used for [DPI](https://en.wikipedia.org/wiki/Deep_packet_inspection).
  - Onigmo - Forked and extended from Oniguruma. Default regex library of Ruby 2.0+.
  - Oniguruma - Popular C regex library. Default regex library of Ruby 1.9.
  - PCRE2 - Popular C regex library used by PHP, R, etc.
  - RE2 - Popular C++ regex library used by Go, etc. Non-backtracking engine.
  - Rust: regex - Non-backtracking engine.
  - Perl - See [perlreguts](https://perldoc.perl.org/perlreguts).
  - Python: re - regex) - Standard and extended regex libraries.
  - ICU - Unicode org's package with full Unicode support.
  - Java: java.util.regex - JDK standard regexes.
  - .NET: System.Text.RegularExpressions - Shared by all .NET languages (C#, VB, etc.).
  - JavaScriptCore: RegExp - Regex engine used by Safari.
  - ICU - Unicode org's package with full Unicode support.
  - V8: Irregexp - Regex engine used by Chrome, Edge, [Firefox](https://hacks.mozilla.org/2020/06/a-new-regexp-engine-in-spidermonkey/), etc.
- Flavor differences
  - Regular Expression Feature Comparisons - features)].
  - Tools & Languages
  - Named capture
  - Comparison of regular expression engines
- Documentation
  - Pattern
  - Syntax
  - re
  - Syntax
  - regex - lite/latest/regex_lite/).
  - Grammars - best-practices)).
  - Regular Expressions - Flavor: ICU.
  - Regular Expressions - Flavor: PCRE.
  - Regexp - Flavor: Onigmo.
  - NSRegularExpression - Flavor: ICU.
  - RegExp - US/docs/Web/JavaScript/Reference/Regular_expressions), [Guide](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions), [Cheatsheet](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions/Cheatsheet).
  - Manual
  - Regular expressions library
  - Introduction
  - Regular Expressions
  - Pattern - summary.html).
  - Overview - us/dotnet/standard/base-types/regular-expression-language-quick-reference), [API](https://learn.microsoft.com/en-us/dotnet/api/system.text.regularexpressions).
  - RE
  - regexp - Flavor: RE2.
Performance
- Benchmarking
  - rebar - benchmark](https://github.com/mariomka/regex-benchmark).
- ReDoS checkers
  - recheck - labs.github.io/recheck/)] - JavaScript and Scala library for detecting ReDoS vulnerability. Can be used as an ESLint plugin.
  - vuln-regex-detector - Perl library for detecting ReDoS vulnerability.
  - regex.rip - Test a regex for ReDoS vulnerability.
- Flavor differences
  - ReDoS
  - Boost.Regex: Performance - Compares Boost, C++ `std::regex`, and others.
- Crafting efficient regexes
  - Runaway Regular Expressions: Catastrophic Backtracking - Exploration and solutions for superlinear backtracking.
  - Book: High Performance JavaScript - *Chapter 5: Strings and Regular Expressions*.
  - Book: Mastering Regular Expressions, 3rd Edition - *Chapter 6: Crafting an Efficient Expression*.
  - Performance of Greedy vs. Lazy Regex Quantifiers - Illustrates the mechanics of backtracking.
- Regex engine optimizations
  - Regular Expression Matching Can Be Simple And Fast - On non-backtracking engines. A [follow up](https://swtch.com/~rsc/regexp/regexp3.html) includes comparisons of RE2 and PCRE performance.
  - Regular Expression Improvements in .NET 7 - performance-improvements-in-net-5/) - Includes detailed explanations of performance optimizations.
  - ripgrep is faster than {grep, …} - Includes details about what makes ripgrep and Rust's `regex` fast.
JavaScript regex libraries
- Alternative regex builders and engines
  - regex - Context-aware regex template tag with advanced features and best practices built-in.
  - XRegExp - Extended regex syntax, flags, and utils; useful for backcompat.
  - incr-regex-package - Partial/incremental matching, used by [react-rxinput](https://github.com/nurulc/react-rxinput) for input validation with a regex mask.
  - node-re2 - Bindings for RE2, a non-backtracking engine.
  - rregex - Bindings for Rust's `regex`, a non-backtracking engine.
- Abstracted regex syntax
  - Rexx - A template tag that uses structured syntax with variables and comments.
  - Melody - lavi.github.io/melody/book/)] - A language that compiles to regexes.
  - compose-regexp.js - regexp](https://github.com/unjs/magic-regexp) \[[*home*](https://regexp.dev/)], [Super Expressive](https://github.com/francisrstokes/super-expressive) \[[*playground*](https://nartc.github.io/ng-super-expressive/)].
- Regex processors
  - regexp-tree - community/regexpp) (used by ESLint), [regjsparser](https://github.com/jviereck/regjsparser)/[regjsgen](https://github.com/bnjmnt4n/regjsgen).
  - regexp-ast-analysis - ast-analysis/docs/latest/)] - Analyze AST nodes produced by regexpp.
  - Regex Colorizer - colorizer/demo/)], [CodeMirror PCRE mode](https://github.com/xavierog/codemirror-mode-pcre).
  - eslint-plugin-regexp - meshi.github.io/eslint-plugin-regexp/)], [eslint-plugin-optimize-regex](https://github.com/BrainMaestro/eslint-plugin-optimize-regex).
  - randexp.js - to-strings](https://github.com/wimpyprogrammer/regex-to-strings).
  - regexgen
  - AST Explorer: RegExp - View ASTs generated by regexp-tree, regexpp, and regjsparser.
JavaScript regex evolution
- Regex processors
  - flag `s` - regexp-lookbehind), [named capture](https://github.com/tc39/proposal-regexp-named-groups), and (behind flag `u`) [Unicode properties](https://github.com/tc39/proposal-regexp-unicode-property-escapes) via `\p{…}` and `\P{…}` (see [list](https://github.com/mathiasbynens/regexpu-core/blob/main/property-escapes.md)).
  - `matchAll`
  - `replaceAll`
  - flag `d`
  - flag `v` - v-flag)] as an upgrade to flag `u` (can't be used together), which adds a set of multicharacter "properties of strings" to `\p{…}`, multicharacter elements within character classes via `\p{…}` and `\q{…|…}`, nested character classes, set operators `[…--…]` and `[…&&…]`, and different escaping rules within character classes. It also fixes case-insensitive matching for `\p` and `\P` within negated `[^…]`.
  - regexpu - unicode-properties)).
  - Duplicate named capturing groups - Ex: `(?<a>…)|(?<a>…)`.
  - Extended mode and comments - Flag `x` (`extended`) with insignificant whitespace and line comments (`#…`), plus inline comments via `(?#…)`.
  - Pattern modifiers - Ex: `(?ims:…)`, `(?-ims:…)`, `(?i-ms:…)`.
  - Atomic operators - Atomic groups via `(?>…)` and possessive quantifiers (ex: `*+`, `++`).
  - Buffer boundaries - Anchors `\A` and `\z`, not affected by flag `m`.
  - \R escape - Outside character classes, `\R` matches any line terminator.
  - Restrict subclassing support in built-ins - Scaled back `RegExp` subclassing.
  - RegExp escaping - `RegExp.escape`.
  - Legacy RegExp features - Standardization of legacy features.
  - Can I use - Up-to-date browser support tables for individual features.
  - standard
  - [*explainer*
  - [*explainer*
  - [*explainer* - folding for flag `i`, and code-point-based matching (with impact on quantifiers, character classes, character class ranges, and built-in sets like `.` and `\W`).
  - lists
  - [*explainer* - tos/run-chromium-with-flags/)].
Testers
- GNU sed REPL
- Pythex
- Rubular
- CyrilEx - Java, JavaScript, MySQL, PHP, Python, Ruby.
- Patterns - regex/raw/main/media/macos.svg" title="macOS" height="13"></picture>, $3) - Bash, Emacs, grep, Java, Oniguruma, PCRE, POSIX BRE, POSIX ERE, Ruby, sed.
- RegexPlanet - Go, Haskell, Java, JavaScript, .NET, Perl, PHP, PostgreSQL, Python, Ruby, Tcl, XRegExp.
- regex101 - **Best free and best web-based tester**.
- RegexBuddy - regex/raw/main/media/windows.svg" title="Windows" height="13"></picture>, $40) - **Best tester**.
- RegExr - **Best open source tester**.
- fork
- RegexLearn - **Best multilingual tester** (JavaScript).
- regexplained - **Best tester for presentations** (JavaScript).
- RegViz
- Regex Storm - storm)].
- PHP Live Regex
Collections of patterns
- ReDoS checkers
  - Book: Regular Expressions Cookbook, 2nd Edition - High-quality solutions with detailed explanations.
  - Regex DB - Solutions include basic descriptions and examples of matching and non-matching text.
Syntax-free regex builders
- ChatGPT - Ex: *"create a regex that matches `X` and explain it step by step"*.
- RegexMagic - regex/raw/main/media/windows.svg" title="Windows" height="13"></picture>, $40) - Generate regexes using samples and rules.
- Regex Generator - generator)] - Generate simple regexes from a sample text.
- Regex.ai - Mark samples in a text and use AI to generate potential regexes.
Visualizers
- Regex Vis - vis)] - Create railroad diagrams, with visual editor. Flavor: JavaScript.
- Regulex - Create railroad diagrams. Flavor: JavaScript.
- Nodexr - Graphical editor with visual hierarchy. Flavor: .NET.
- Regex Nodes - nodes)] - Graphical editor with visual hierarchy. Flavor: JavaScript.
- Debuggex - Create railroad diagrams. Flavors: JavaScript, PCRE, Python.
- RegExper - static)] - Create railroad diagrams. Flavor: JavaScript.
Miscelaneous
- Regex processors
  - regex101 Regex Quiz - Requires sign-in.
  - Regex - Regex search on webpages via `Ctrl+Shift+F`.
  - Regex Crossword
  - xkcd
Tutorials
- Videos
  - *Demystifying Regular Expressions* - Great presentation for beginners, by Lea Verou at HolyJS 2017 (1hr 12m).
  - *Learn Regular Expressions In 20 Minutes* - Live syntax walkthrough in a regex tester, by Kyle Cook.
  - Udemy
- Traditional
  - Regular-Expressions.info - Covers numerous regex flavors.
  - The Modern JavaScript Tutorial: Regular expressions - tutorial/en.javascript.info)] - Guide to using regexes in modern JavaScript.
  - others
  - RexEgg - Detailed tutorial with advanced topics.
  - learnbyexample - Ebooks on regexes ([JavaScript](https://learnbyexample.github.io/learn_js_regexp/), [Python](https://learnbyexample.github.io/py_regular_expressions/), [Ruby](https://learnbyexample.github.io/Ruby_Regexp/)) and command line text processing.
  - Regular Expressions for Regular Folk - for-regular-folk)] - Visual, example-based ebook for beginners.
- With interactive exercises
  - RegexLearn - Interactive tutorial and practice problems.
  - RegexOne - Interactive tutorial and practice problems.
Books
- Regex processors
  - *Regular Expressions Cookbook, 2nd Edition* - Regex tutorial with code samples for eight programming languages, 100+ regex recipes for practical problems, and a deep focus on cross-flavor differences.
  - *Mastering Regular Expressions, 3rd Edition* - A computer science classic, best for people who already know the basics. Includes good coverage of crafting efficient regexes.
  - *Introducing Regular Expressions* - An intro for programmers new to regular expressions that sticks to the basics.
Articles
- Regex processors
  - *The World's Shortest Regex Compiler?* - dfa) on optimization - Introduction to writing a non-backtracking regex engine (in JavaScript).
  - *Regex Legends: The People Behind the Magic* - Influential people behind the technology.
  - *Fun With .NET Regex Balancing Groups* - Advanced usage of a .NET-only regex feature.
Communities
- Regex processors
  - Reddit: r/regex
  - Stack Overflow: [regex]

Programming Languages

JavaScript 16 HTML 6 C 3 C++ 3 Rust 3 TypeScript 2 Perl 1 Scala 1 Python 1 C# 1

Ecosyste.ms: Awesome

awesome-regex

Grep-like tools

Command line

GUI

Regex engines

Source code

Flavor differences

Documentation

Performance

Benchmarking

ReDoS checkers

Flavor differences

Crafting efficient regexes

Regex engine optimizations

JavaScript regex libraries

Alternative regex builders and engines

Abstracted regex syntax

Regex processors

JavaScript regex evolution

Regex processors

Testers

Collections of patterns

ReDoS checkers

Syntax-free regex builders

Visualizers

Miscelaneous

Regex processors

Tutorials

Videos

Traditional

With interactive exercises

Books

Regex processors

Articles

Regex processors

Communities

Regex processors