awesome-regex

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

Last synced: 1 day ago
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JavaScript regex libraries
- Alternative regex builders and engines
  - rregex - Bindings for Rust's `regex`, a non-backtracking engine.
  - Oniguruma-To-ES - Convert Oniguruma patterns to native JavaScript regexes.
  - XRegExp - Extended regex syntax, flags, and utils; useful for backcompat.
  - Regex+ - A template tag for extended, readable, high-performance JavaScript regexes.
  - 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 - oniguruma](https://github.com/microsoft/vscode-oniguruma) (Oniguruma).
- Regex processors
  - regexp-tree - community/regexpp) (used by ESLint), [regjsparser](https://github.com/jviereck/regjsparser)/[regjsgen](https://github.com/bnjmnt4n/regjsgen).
  - AST Explorer: RegExp - regexp-ast-viewer/).
  - Regex Colorizer - colorizer/demo/)], [CodeMirror PCRE mode](https://github.com/xavierog/codemirror-mode-pcre).
  - regexpp - tree](https://github.com/DmitrySoshnikov/regexp-tree) (includes optimizer, etc.), [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.
  - eslint-plugin-regexp - meshi.github.io/eslint-plugin-regexp/)], [eslint-plugin-optimize-regex](https://github.com/BrainMaestro/eslint-plugin-optimize-regex).
  - regex-utils - Check regex equivalence, build regex intersections, and other meta utilities.
  - regex-to-mermaid - Generate Mermaid diagrams to visualize regexes within Markdown docs, etc.
  - randexp.js - to-strings](https://github.com/wimpyprogrammer/regex-to-strings).
  - regexgen
- 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/)].
JavaScript regex evolution
- Regex processors
  - Duplicate named capturing groups - Ex: `(?<a>…)|(?<a>…)`.
  - RegExp escaping - `RegExp.escape`.
  - `replaceAll`
  - *Regexes Got Good: The History And Future Of Regular Expressions In JavaScript*
  - regexpu - unicode-properties)).
  - Extended mode and comments - Flag `x` (`extended`) with insignificant whitespace and line comments (`#…`), plus inline comments via `(?#…)`.
  - 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.
  - Legacy RegExp features - Standardization of legacy features.
  - [*explainer* - folding for flag `i`, and code point matching (with impact on quantifiers, character classes, ranges, and built-in sets).
  - lists
  - standard
  - standard
  - flag `v` - v-flag)] as an upgrade to flag `u`, 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 `[^…]`.
  - [*explainer* - tos/run-chromium-with-flags/)].
  - Can I use - Up-to-date browser support tables for individual features.
  - Atomic operators - Atomic groups via `(?>…)` and possessive quantifiers (ex: `*+`, `++`).
  - [*explainer*
  - [*explainer*
  - flag `s` - regexp-lookbehind), [named capture](https://github.com/tc39/proposal-regexp-named-groups), and [Unicode properties](https://github.com/tc39/proposal-regexp-unicode-property-escapes) (via `\p{…}` and `\P{…}` which require flag `u`; see [list](https://github.com/mathiasbynens/regexpu-core/blob/main/property-escapes.md)).
  - `matchAll`
  - flag `d`
  - modifiers - duplicate-named-capturing-groups) in separate alternation paths, and [`RegExp.escape`](https://github.com/tc39/proposal-regex-escaping).
Regex engines
- Documentation
  - Manual
  - Regular expressions library
  - Introduction
  - re
  - regex - See also: [regex-lite](https://docs.rs/regex-lite).
  - Regex - See also: [RegexBuilder](https://developer.apple.com/documentation/regexbuilder), [NSRegularExpression](https://developer.apple.com/documentation/foundation/nsregularexpression).
  - Regular Expressions - Flavor: ICU.
  - RE
  - Regular Expressions - Flavor: PCRE.
  - Regexp - Flavor: Onigmo.
  - Regular Expressions
  - Pattern - summary.html).
  - 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).
  - Overview - us/dotnet/standard/base-types/regular-expression-language-quick-reference), [API](https://learn.microsoft.com/en-us/dotnet/api/system.text.regularexpressions).
  - RE
  - Pattern
  - Syntax
  - regexp - Flavor: RE2.
  - Pattern
  - re
  - regex - lite/latest/regex_lite/).
  - Regular Expressions - Flavor: ICU.
  - NSRegularExpression - Flavor: ICU.
  - Manual
  - Regular expressions library
  - Introduction
  - Manual
  - Syntax
  - Regex - See also: [RegexBuilder](https://developer.apple.com/documentation/regexbuilder), [NSRegularExpression](https://developer.apple.com/documentation/foundation/nsregularexpression).
  - Grammars - best-practices)).
- Source code
  - Perl - See [perlreguts](https://perldoc.perl.org/perlreguts).
  - Python: re - regex) - Standard and extended regex libraries.
  - RE2 - Popular C++ regex library used by Go, etc. Non-backtracking engine.
  - Java: java.util.regex - JDK standard regexes.
  - JavaScriptCore: RegExp - Regex engine used by Safari.
  - .NET: System.Text.RegularExpressions - Shared by all .NET languages (C#, VB, etc.).
  - Onigmo - Forked from Oniguruma. Used by Ruby 2.0+.
  - Rust: regex - Non-backtracking engine.
  - 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.
  - Oniguruma - Popular C regex library used by Ruby 1.9, TextMate grammars, etc.
  - PCRE2 - Popular C regex library used by PHP, R, etc.
  - Boost.Regex - Popular C++ regex library.
  - Hyperscan - Intel's high-performance library, used for [DPI](https://en.wikipedia.org/wiki/Deep_packet_inspection).
  - ICU - Unicode org's package with full Unicode support.
- Flavor differences
  - Regular Expression Feature Comparisons - features)].
  - Tools & Languages
  - Comparison of regular expression engines
  - Named capture
Performance
- Regex engine optimization
  - ripgrep is faster than {grep, …} - Includes details about what makes ripgrep and Rust's `regex` fast.
  - 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.
- Benchmarking
  - Boost.Regex: Performance - Compares Boost, C++ `std::regex`, and others.
  - rebar - benchmark](https://github.com/mariomka/regex-benchmark).
  - 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.
  - Performance of Regular Expressions - On backtracking performance, with detailed examples.
- ReDoS checkers
  - vuln-regex-detector - Perl library for detecting ReDoS vulnerability.
  - regex.rip - Test a regex for ReDoS vulnerability.
  - recheck - labs.github.io/recheck/)] - JavaScript and Scala library for detecting ReDoS vulnerability. Can be used as an ESLint plugin.
- Flavor differences
  - Boost.Regex: Performance - Compares Boost, C++ `std::regex`, and others.
  - ReDoS
- Regex engine optimizations
  - ripgrep is faster than {grep, …} - Includes details about what makes ripgrep and Rust's `regex` fast.
Testers
- Patterns - regex/media/macos.svg" title="macOS" height="13">, $3) - Bash, Emacs, grep, Java, Oniguruma, PCRE, POSIX BRE, POSIX ERE, Ruby, sed.
- RegexPlanet - Go, Java, JavaScript (Bun, Deno, Node.js), .NET, Perl, PHP, PostgreSQL, Python, Ruby, Rust, Swift, Tcl, XRegExp.
- GNU sed REPL
- pcre2test - Includes regex debugger. Flavor: PCRE.
- rxrx - Includes regex debugger ([video intro](https://www.youtube.com/watch?v=zcSFIUiMgAs)). Flavor: Perl.
- fancy-regex playground - regex/fancy-regex/tree/main/playground)].
- RegViz
- Regex Storm - storm)].
- PHP Live Regex
- Rubular
- Swift Regex - Includes regex debugger, DSL builder.
- CyrilEx - Java, JavaScript, MySQL, PHP, Python, Ruby.
- Pythex
- RegViz
- Regex Storm - storm)].
- regex101 - **Best free and best web-based tester**.
- RegexBuddy - regex/media/windows.svg" title="Windows" height="13">, $40) - **Best tester**.
- RegExr - **Best open source tester**.
- fork
- RegexLearn - **Best multilingual tester** (JavaScript).
- regexplained - **Best tester for presentations** (JavaScript).
Syntax-free regex builders
- RegexMagic - regex/media/windows.svg" title="Windows" height="13">, $40) - Generate regexes using samples and rules.
- ChatGPT - Ex: *"create a regex that matches `X` and explain it step by step"*.
- Regex Generator - generator)] - Generate simple regexes from a sample text.
- Regex.ai - Mark samples in a text and use AI to generate potential regexes.
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.
Articles
- Regex processors
  - *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.
  - *The World's Shortest Regex Compiler?* - dfa) on optimization - Introduction to writing a non-backtracking regex engine (in JavaScript).
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.
Grep-like tools
- Command line
  - nomino - Rename files uses regexes.
  - ripgrep - Better and faster grep. Recursively searches directories while respecting gitignore rules and skipping hidden/binary files.
  - Feature comparison of grep-like tools
- GUI
  - RegexRenamer - regex/raw/main/media/windows.svg" title="Windows" height="13"></picture>) - Rename files using regexes.
  - PowerGREP - regex/media/windows.svg" title="Windows" height="13">, $159) - Can search through archives, binary files, PDFs, docs/sheets, emails, etc., via its GUI or the command line.
  - PowerRename - regex/media/windows.svg" title="Windows" height="13">) - Rename files using regexes.
  - Aba Search and Replace - regex/media/windows.svg" title="Windows" height="13">, $30) - Displays matches as you type.
Tutorials
- Traditional
  - The Modern JavaScript Tutorial: Regular expressions - tutorial/en.javascript.info)] - Guide to using regexes in JavaScript.
  - others
  - RexEgg - Detailed tutorial with advanced topics.
  - learnbyexample - Ebooks on regexes ([JavaScript](https://learnbyexample.github.io/learn_js_regexp/), [Python](https://learnbyexample.github.io/py_regular_expressions/), [Ruby](https://learnbyexample.github.io/Ruby_Regexp/)) and command line text processing.
  - Regular Expressions for Regular Folk - for-regular-folk)] - Visual, example-based ebook for beginners.
  - Regular-Expressions.info - Covers numerous regex flavors.
- With interactive exercises
  - RegexLearn - Interactive tutorial and practice problems.
  - RegexOne - Interactive tutorial and practice problems.
- Videos
  - *Learn Regular Expressions In 20 Minutes* - Live syntax walkthrough in a regex tester, by Kyle Cook.
  - *Demystifying Regular Expressions* - Great presentation for beginners, by Lea Verou at HolyJS 2017 (1hr 12m).
  - Udemy
Miscelaneous
- Regex processors
  - Regex - Regex search on webpages via `Ctrl+Shift+F`.
Communities
- Regex processors
  - Reddit: r/regex
  - Stack Overflow: [regex]
Books
- Regex processors
  - *Regular Expressions Cookbook, 2nd Edition* - Regex tutorial with code samples for eight programming languages, 100+ regex recipes for practical problems, and a deep focus on cross-flavor differences.
  - *Mastering Regular Expressions, 3rd Edition* - A computer science classic, best for people who already know the basics. Includes good coverage of crafting efficient regexes.
  - *Introducing Regular Expressions* - An intro for programmers new to regular expressions that sticks to the basics.
Miscellaneous
- Regex processors
  - regex101 Regex Quiz - Requires sign-in.
  - Regex Crossword - machina/) ($).
  - xkcd
About
- Regex processors
  - Steven Levithan - regex/graphs/contributors).
- Sponsors and backers
  - <img src="https://github.com/roboflow.png" width="40" height="40">
- Past sponsors

Programming Languages

JavaScript 17 HTML 6 Rust 4 TypeScript 3 C 3 C++ 3 Scala 1 Python 1 Perl 1 C# 1

awesome-regex

JavaScript regex libraries

Alternative regex builders and engines

Regex processors

Abstracted regex syntax

JavaScript regex evolution

Regex processors

Regex engines

Documentation

Source code

Flavor differences

Performance

Regex engine optimization

Benchmarking

Crafting efficient regexes

ReDoS checkers

Flavor differences

Regex engine optimizations

Testers

Syntax-free regex builders

Collections of patterns

ReDoS checkers

Articles

Regex processors

Visualizers

Grep-like tools

Command line

GUI

Tutorials

Traditional

With interactive exercises

Videos

Miscelaneous

Regex processors

Communities

Regex processors

Books

Regex processors

Miscellaneous

Regex processors

About

Regex processors

Sponsors and backers

Past sponsors