๐ฆ A curated collection of regex tools, tutorials, libraries, etc.
This page lists names, links and short descriptions. The original list on GitHub is the source and belongs to its authors.
is a lightweight JavaScript library for more readable, high-performance, native JavaScript regexes with powerful features including free spacing, atomic groups, possessive quantifiers, subroutines, definition groups, and context-aware interpolation.
Best free and best web-based tester.; Flavors: Java, JavaScript, .NET, PCRE, RE2, Rust, and emulates Python.; Includes regex debugger (PCRE only).
(Windows, $40) - Best tester.; Flavors: Emulates hundreds of flavors/versions, with deep knowledge of differences.; Includes regex debugger.
(macOS, $21) - Best Mac-native tester.; Flavors: JavaScript, Python (re, regex), Java, .NET, PCRE, Onigmo, RE2, Perl, Rust, ICU, Tcl, POSIX BRE/ERE.
[GitHub] - Best open source tester.; Flavors: JavaScript, PCRE.; Languages: ๐บ๐ธ, ๐จ๐ณ (fork).
[GitHub] - Best multilingual tester (JavaScript).; Languages: ๐บ๐ธ, ๐น๐ท, ๐ท๐บ, ๐ช๐ธ, ๐จ๐ณ, ๐ฉ๐ช, ๐บ๐ฆ, ๐ซ๐ท, ๐ต๐ฑ, ๐ฐ๐ท, ๐ง๐ท, ๐จ๐ฟ, ๐ฌ๐ช.
[GitHub] - Best tester for presentations (JavaScript).
Includes regex debugger. Flavor: PCRE.
Includes regex debugger (video intro). Flavor: Perl.
[GitHub] - Java, JavaScript, MySQL, PHP, Python, Ruby.
(macOS, $3) - Bash, Emacs, grep, Java, Oniguruma, PCRE, POSIX BRE, POSIX ERE, Ruby, sed.
[GitHub] - Go, Java, JavaScript (Bun, Deno, Node.js), .NET, Perl, PHP, PostgreSQL, Python, Ruby, Rust, Swift, Tcl, XRegExp.
and other LLMs - Ex: "create a regex that matches X and explain it step by step".
(Windows, $40) - Generate regexes using samples and rules.; Flavors: Emulates hundreds of flavors/versions.
[GitHub] - Generate simple regexes from a sample text.
Mark samples in a text and use AI to generate potential regexes.
[GitHub] - Graphical editor with visual hierarchy. Flavor: JavaScript.
Create railroad diagrams. Flavors: JavaScript, PCRE, Python.
[GitLab] - Create railroad diagrams. Flavor: JavaScript.
(Windows, $30) - Displays matches as you type.
(Windows, $159) - Can search through archives, binary files, PDFs, docs/sheets, emails, etc., via its GUI or the command line.; Flavors: Emulates hundreds of flavors/versions.
(Windows) - Rename files using regexes.
Covers numerous regex flavors.
[GitHub] - Guide to using regexes in JavaScript.; Languages: ๐บ๐ธ, ๐ช๐ธ, ๐ซ๐ท, ๐ฎ๐น, ๐ฏ๐ต, ๐ท๐บ, ๐บ๐ฆ, ๐จ๐ณ (partial for others).
Detailed tutorial with advanced topics.
[GitHub] - Ebooks on regexes (JavaScript, Python, Ruby) and command line text processing.
[GitHub] - Visual, example-based ebook for beginners.
[GitHub] - Interactive tutorial and practice problems.; Languages: ๐บ๐ธ, ๐น๐ท, ๐ท๐บ, ๐ช๐ธ, ๐จ๐ณ, ๐ฉ๐ช, ๐บ๐ฆ, ๐ซ๐ท, ๐ต๐ฑ, ๐ฐ๐ท, ๐ง๐ท, ๐จ๐ฟ, ๐ฌ๐ช.
Interactive tutorial and practice problems.
Great presentation for beginners, by Lea Verou at HolyJS 2017 (1hr 12m).
Live syntax walkthrough in a regex tester, by Kyle Cook.
C++ regex library.
Intel's high-performance library, used for DPI.
Unicode org's package with full Unicode support.
JDK standard regexes.
Regex engine used by Safari.
Regex engine used by Chrome, Edge, Firefox, etc.
Shared by all .NET languages (C#, VB, etc.).
Forked from Oniguruma. Used by Ruby 2.0+.
Popular C regex library used by PHP, R, etc.
See perlreguts.
and regex - Standard and extended regex libraries.
Non-backtracking engine.
Exploration and solutions for superlinear backtracking.
(2010) - Chapter 5: Strings and Regular Expressions.
(2006) - Chapter 6: Crafting an Efficient Expression.
Illustrates the mechanics of backtracking.
On backtracking performance, with detailed examples.
On non-backtracking engines. A follow up includes comparisons of RE2 and PCRE performance.
and .NET 5 - Includes detailed explanations of performance optimizations.
Includes details about what makes ripgrep and Rust's regex fast.
Compares Boost, C++ std::regex, and others.
Test a regex for ReDoS vulnerability.
[home] - JavaScript and Scala library for detecting ReDoS vulnerability. Can be used as an ESLint plugin.
Perl library for detecting ReDoS vulnerability.
(2012) - High-quality solutions with detailed explanations.; Flavors: Java, JavaScript, .NET, PCRE, Perl, Python, Ruby, XRegExp.
Solutions include basic descriptions and examples of matching and non-matching text.
is a lightweight JavaScript library for more readable, high-performance, native JavaScript regexes with powerful features including free spacing, atomic groups, possessive quantifiers, subroutines, definition groups, and context-aware interpolation.
Convert Oniguruma patterns to native JavaScript regexes.
[docs] - Analyze AST nodes produced by regexpp.
[home] - ESLint plugin for finding regex mistakes, etc.
RegExp-equivalent constructor with TS types.
Add an execution timeout to regexes.
Check regex equivalence, build regex intersections, and other utilities.
Generate a regex that matches a set of strings.
[home] - Highlight regex syntax.
Generate Mermaid diagrams to visualize regexes.
(2021) - Flag x (extended) with insignificant whitespace and line comments (#โฆ), plus inline comments via (?#โฆ).
(2021) - Atomic groups via (?>โฆ) and possessive quantifiers (ex: *+, ++).
(2021) - Anchors \A and \z, not affected by flag m.
(2021) - Outside character classes, \R matches any line terminator.
(2020) - Scaled back RegExp subclassing.
(2015) - Standardization of legacy features.
(2012) by Jan Goyvaerts and Steven Levithan - Regex tutorial with code samples for eight programming languages, 100+ regex recipes for practical problems, and a deep focus on cross-flavor differences.; Flavors: Java, JavaScript, .NET, PCRE, Perl, Python, Ruby, XRegExp.
(2006) by Jeffrey Friedl - A computer science classic, best for people who already know the basics. Includes good coverage of crafting efficient regexes.; Flavors: Dedicated chapters on Java, .NET, Perl, and PHP (PCRE), with more limited coverage of Python, Tcl, command line tools, etc.
(2012) by Michael Fitzgerald - An intro for programmers new to regular expressions that sticks to the basics.
and a follow up on optimization - Introduction to writing a non-backtracking regex engine (in JavaScript).
Influential people behind the technology.
Questions and help on all topics concerning regular expressions.
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