awesome-regex

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

Last synced: 4 days ago
JSON representation

Testers
- Patterns - Bash, Emacs, grep, Java, Oniguruma, PCRE, POSIX BRE, POSIX ERE, Ruby, sed.
- regex101 - **Best free and best web-based tester**.
- RegExr - **Best open source tester**.
- Rubular
- CyrilEx - Java, JavaScript, MySQL, PHP, Python, Ruby.
- RegViz
- Regex Storm - storm)].
- PHP Live Regex
- Pythex
- RegexBuddy - **Best tester**.
- fork
- RegexLearn - **Best multilingual tester** (JavaScript).
- regexplained - **Best tester for presentations** (JavaScript).
- 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)].
- Swift Regex - Includes regex debugger, DSL builder.
JavaScript regex evolution
- Regex processors, utilities, and more
  - Can I use - Up-to-date browser support tables for individual features.
  - [*explainer*
  - [*explainer*
  - [*explainer* - folding for flag `i`, and code point matching (with impact on quantifiers, character classes, ranges, and built-in sets).
  - [*explainer* - tos/run-chromium-with-flags/)].
  - `replaceAll`
  - regexpu - unicode-properties)).
  - 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`
  - 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 `[^…]`.
  - Extended mode and comments - Flag `x` (`extended`) with insignificant whitespace and line comments (`#…`), plus inline comments via `(?#…)`.
  - modifiers - duplicate-named-capturing-groups) in separate alternation paths, and [`RegExp.escape`](https://github.com/tc39/proposal-regex-escaping).
  - 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.
  - Legacy RegExp features - Standardization of legacy features.
  - standard
  - *Regexes Got Good: The History And Future Of Regular Expressions In JavaScript*
- Regex processors
  - standard
  - lists
  - Duplicate named capturing groups - Ex: `(?<a>…)|(?<a>…)`.
  - RegExp escaping - `RegExp.escape`.
JavaScript regex libraries
- Regex processors, utilities, and more
  - AST Explorer: RegExp - regexp-ast-viewer/).
  - randexp.js - to-strings](https://github.com/wimpyprogrammer/regex-to-strings).
  - regexgen - Generate a regex that matches a set of strings.
  - eslint-plugin-regexp - meshi.github.io/eslint-plugin-regexp/)] - ESLint plugin for finding regex mistakes, etc.
  - super-regex - Add an execution timeout to regexes.
  - regexp-ast-analysis - ast-analysis/docs/latest/)] - Analyze AST nodes produced by regexpp.
  - Regex Colorizer - colorizer/demo/)] - Highlight regex syntax.
  - regex-utils - Check regex equivalence, build regex intersections, and other utilities.
  - regexpp - tree](https://github.com/DmitrySoshnikov/regexp-tree), [regjsparser](https://github.com/jviereck/regjsparser)/[regjsgen](https://github.com/bnjmnt4n/regjsgen), [regexp-simple-parser](https://github.com/fabiospampinato/regexp-simple-parser).
  - regex-to-mermaid - Generate Mermaid diagrams to visualize regexes.
  - arkregex - `RegExp`-equivalent constructor with TS types.
  - regex-partial-match - regex-package](https://github.com/nurulc/incr-regex-package).
- Alternative regex builders and engines
  - 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).
  - rregex - Bindings for Rust's `regex`, a non-backtracking engine.
  - Oniguruma-To-ES - Convert Oniguruma patterns to native JavaScript regexes.
- Abstracted regex syntax
  - Melody - lavi.github.io/melody/book/)] - A language that compiles to regexes.
  - Rexx - A template tag that uses structured syntax with variables and comments.
  - 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).
Visualizers
- Debuggex - Create railroad diagrams. Flavors: JavaScript, PCRE, Python.
- Nodexr - Graphical editor with visual hierarchy. Flavor: .NET.
- Regexper - static)] - Create railroad diagrams. Flavor: JavaScript.
- Regulex - Create railroad diagrams. Flavor: JavaScript.
- Regex Nodes - nodes)] - Graphical editor with visual hierarchy. Flavor: JavaScript.
- Regex Vis - vis)] - Create railroad diagrams, with visual editor. Flavor: JavaScript.
Performance
- Regex engine optimization
  - 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.
- Regex engine optimizations
  - ripgrep is faster than {grep, …} - Includes details about what makes ripgrep and Rust's `regex` fast.
- 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.
  - Performance of Regular Expressions - On backtracking performance, with detailed examples.
- ReDoS checkers
  - regex.rip - Test a regex for ReDoS vulnerability.
  - vuln-regex-detector - Perl library for detecting ReDoS vulnerability.
  - recheck - labs.github.io/recheck/)] - JavaScript and Scala library for detecting ReDoS vulnerability. Can be used as an ESLint plugin.
- Benchmarking
  - rebar - benchmark](https://github.com/mariomka/regex-benchmark).
  - Boost.Regex: Performance - Compares Boost, C++ `std::regex`, and others.
Miscellaneous
- Regex processors, utilities, and more
  - Regex Crossword - machina/) ($).
  - regex101 Regex Quiz - Requires sign-in.
  - xkcd
Communities
- Regex processors, utilities, and more
  - Reddit: r/regex
  - Stack Overflow: [regex]
Tutorials
- With interactive exercises
  - RegexOne - Interactive tutorial and practice problems.
  - RegexLearn - Interactive tutorial and practice problems.
- Traditional
  - Regular-Expressions.info - Covers numerous regex flavors.
  - Regular Expressions for Regular Folk - for-regular-folk)] - Visual, example-based ebook for beginners.
  - 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.
- 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
About
- Past sponsors
- Regex processors, utilities, and more
  - Steven Levithan - regex/graphs/contributors).
- Sponsors and backers
  - <img src="https://github.com/roboflow.png" width="40" height="40">
Regex engines
- Documentation
  - Syntax
  - regex - lite/latest/regex_lite/).
  - 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
  - Pattern
  - re
  - Syntax
  - Grammars - best-practices)).
  - Regular Expressions - Flavor: ICU.
  - Regular Expressions - Flavor: PCRE.
  - Regexp - Flavor: Onigmo.
  - NSRegularExpression - Flavor: ICU.
  - regexp - Flavor: RE2.
  - Manual
  - RE
  - Pattern
  - Regex - See also: [RegexBuilder](https://developer.apple.com/documentation/regexbuilder), [NSRegularExpression](https://developer.apple.com/documentation/foundation/nsregularexpression).
- Source code
  - V8: Irregexp - Regex engine used by Chrome, Edge, [Firefox](https://hacks.mozilla.org/2020/06/a-new-regexp-engine-in-spidermonkey/), etc.
  - 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.).
  - Perl - See [perlreguts](https://perldoc.perl.org/perlreguts).
  - Python: re - regex) - Standard and extended regex libraries.
  - JavaScriptCore: RegExp - Regex engine used by Safari.
  - ICU - Unicode org's package with full Unicode support.
  - RE2 - Popular C++ regex library used by Go, etc. Non-backtracking engine.
  - Hyperscan - Intel's high-performance library, used for [DPI](https://en.wikipedia.org/wiki/Deep_packet_inspection).
  - Oniguruma - C regex library used by Ruby 1.9, TextMate grammars, etc.
  - Rust: regex - Non-backtracking engine.
  - PCRE2 - Popular C regex library used by PHP, R, etc.
  - Onigmo - Forked from Oniguruma. Used by Ruby 2.0+.
  - Boost.Regex - C++ regex library.
- Flavor differences
  - Tools & Languages
  - Named capture
  - Comparison of regular expression engines
  - Regular Expression Feature Comparisons - features)].
Syntax-free regex builders
- Regex.ai - Mark samples in a text and use AI to generate potential regexes.
- ChatGPT - Ex: *"create a regex that matches `X` and explain it step by step"*.
- RegexMagic - Generate regexes using samples and rules.
- Regex Generator - generator)] - Generate simple regexes from a sample text.
Grep-like tools
- Command line
  - Feature comparison of grep-like tools
  - ripgrep - Better and faster grep. Recursively searches directories while respecting gitignore rules and skipping hidden/binary files.
  - nomino - Rename files uses regexes.
- GUI
  - Aba Search and Replace - Displays matches as you type.
  - PowerGREP - 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.
  - PowerRename - Rename files using 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.
Books
- Regex processors, utilities, and more
  - *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, utilities, and more
  - *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.
- Regex processors
  - *Fun With .NET Regex Balancing Groups* - Advanced usage of a .NET-only regex feature.
Miscelaneous
- Regex processors
  - Regex - Regex search on webpages via `Ctrl+Shift+F`.

Programming Languages

JavaScript 18 HTML 6 Rust 4 TypeScript 3 C 3 C++ 3 Scala 1 Python 1 Perl 1 C# 1

awesome-regex

Testers

JavaScript regex evolution

Regex processors, utilities, and more

Regex processors

JavaScript regex libraries

Regex processors, utilities, and more

Alternative regex builders and engines

Abstracted regex syntax

Regex processors

Visualizers

Performance

Regex engine optimization

Regex engine optimizations

Flavor differences

Crafting efficient regexes

ReDoS checkers

Benchmarking

Miscellaneous

Regex processors, utilities, and more

Communities

Regex processors, utilities, and more

Tutorials

With interactive exercises

Traditional

Videos

About

Past sponsors

Regex processors, utilities, and more

Sponsors and backers

Regex engines

Documentation

Source code

Flavor differences

Syntax-free regex builders

Grep-like tools

Command line

GUI

Collections of patterns

ReDoS checkers

Books

Regex processors, utilities, and more

Articles

Regex processors, utilities, and more

Regex processors

Miscelaneous

Regex processors