awesome-regex

( , $40) -

[ ] -

Languages: 🇺🇸, 🇨🇳 ( )

[ ] - (JavaScript)

[ ] - (JavaScript)

JavaScript:

.NET: [ ]

PCRE:

Python:

Ruby:

sed:

[ ] - Java, JavaScript, MySQL, PHP, Python, Ruby

( , $3) - Bash, Emacs, grep, Java, Oniguruma, PCRE, POSIX BRE, POSIX ERE, Ruby, sed

[ ] - Go, Haskell, Java, JavaScript, .NET, Perl, PHP, PostgreSQL, Python, Ruby, Tcl, XRegExp

(and other LLMs) - Ex:

( , $40) - Generate regexes using samples and rules

[ ] - Generate simple regexes from a sample text

Mark samples in a text and use AI to generate potential regexes

[ ] - Create railroad diagrams, with visual editor. Flavor: JavaScript

[ ] - Create railroad diagrams. Flavor: JavaScript

[ ] - Graphical editor with visual hierarchy. Flavor: .NET

[ ] - Graphical editor with visual hierarchy. Flavor: JavaScript

Create railroad diagrams. Flavors: JavaScript, PCRE, Python

[ ] - Create railroad diagrams. Flavor: JavaScript

ripgrep

Better and faster grep. Recursively searches directories while respecting gitignore rules and skipping hidden/binary files

( , $30) - Displays matches as you type

( , $159) - Can search through archives, binary files, PDFs, docs/sheets, emails, etc., via its GUI or the command line

PowerRename

( ) - Rename files using regexes

Covers numerous regex flavors

[ ] - Guide to using regexes in JavaScript

Languages: 🇺🇸, 🇪🇸, 🇫🇷, 🇮🇹, 🇯🇵, 🇷🇺, 🇺🇦, 🇨🇳 (partial for )

Detailed tutorial with advanced topics

[ ] - Ebooks on regexes ( , , ) and command line text processing

[ ] - Visual, example-based ebook for beginners

[ ] - Interactive tutorial and practice problems

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

Many options for video courses are available on ($)

Boost.Regex:

C++:

Hyperscan:

ICU:

Java: ,

JavaScript: , , ,

.NET: , ,

RE

Onigmo:

RE

Oniguruma:

PCRE2: ,

Perl: , ,

Python:

Syntax

RE2:

Rust: ,

Go: - Flavor: RE2

MySQL: - Flavor: ICU

PHP: - Flavor: PCRE

Ruby: - Flavor: Onigmo

Swift: - Flavor: ICU

Boost.Regex

Popular C++ regex library

Hyperscan

Intel's high-performance library, used for

ICU

Unicode org's package with full Unicode support

Java: java.util.regex

JDK standard regexes

JavaScriptCore: RegExp

Regex engine used by Safari

V8: Irregexp

Regex engine used by Chrome, Edge, , etc

.NET: System.Text.RegularExpressions

Shared by all .NET languages (C#, VB, etc.)

Onigmo

Forked from Oniguruma. Used by Ruby 2.0+

Oniguruma

Popular C regex library used by Ruby 1.9, TextMate grammars, etc

PCRE2

Popular C regex library used by PHP, R, etc

Perl

See

Python: re

and - Standard and extended regex libraries

RE2

Popular C++ regex library used by Go, etc. Non-backtracking engine

Rust: regex

Non-backtracking engine

Ron Buckton: [ ]

Regular-Expressions.info:

Steven Levithan: ,

Wikipedia:

Exploration and solutions for superlinear backtracking

(2010) -

(2006) -

Illustrates the mechanics of backtracking

On backtracking performance, with detailed examples

On non-backtracking engines. A includes comparisons of RE2 and PCRE performance

and - Includes detailed explanations of performance optimizations

Includes details about what makes ripgrep and Rust's fast

rebar

Cross-engine benchmarking libraries: ,

Compares Boost, C++ , and others

Test a regex for ReDoS vulnerability

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

(2012) - High-quality solutions with detailed explanations

Solutions include basic descriptions and examples of matching and non-matching text

Regex+

A template tag for extended, readable, high-performance JavaScript regexes

Oniguruma-To-ES

Convert Oniguruma patterns to native JavaScript regexes

XRegExp

[ ] - Extended regex syntax, flags, and utils; useful for backcompat

incr-regex-package

Partial/incremental matching, used by for input validation with a regex mask

node-re2

Use other engines via WASM bindings: (RE2), (Rust's ), (Oniguruma)

Rexx

A template tag that uses structured syntax with variables and comments

Melody

[ ] - A language that compiles to regexes

compose-regexp.js

Compose with functions: , (implementations for ), [ ], [ ]

regexpp

AST builders: (used by ESLint), (includes optimizer, etc.), /

View ASTs generated by regexp-tree, regexpp, and regjsparser

regexp-ast-analysis

[ ] - Analyze AST nodes produced by regexpp

Regex Colorizer

Highlight regex syntax: [ ],

eslint-plugin-regexp

Find regex mistakes and improvements: [ ],

randexp.js

Generate strings that match a given regex: ,

regexgen

Generate a regex from given strings:

ES5 (2009) fixed unintuitive behavior by creating a new object every time regex literals are evaluated [ ], and allowed regex literals to use unescaped forward slashes within character classes ( )

ES6/ES2015 added: [ ]

Flag ( ) [ ] [ ], which adds Unicode code point escapes via , strict errors (for unreserved escapes, octal escapes, quantified lookahead, and unescaped special characters in some contexts), Unicode case-folding for flag , and code point matching (with impact on quantifiers, character classes, ranges, and built-in sets)

flag s

ES2018 added ( ), , , and (via and which require flag ; see )

matchAll

ES2020 added string method (which returns an iterator), plus

flag d

ES2022 added ( ), which provides start/end indices for matched substrings

flag v

ES2024 added ( ) [ ] as an upgrade to flag , which adds a set of multicharacter "properties of strings" to , multicharacter elements within character classes via and , nested character classes, set operators and , and different escaping rules within character classes. It also fixes case-insensitive matching for and within negated

regexpu

Backcompat libraries: , ( )

Chrome's ( ) regex flag, behind a V8 flag [ ] [ ]

Up-to-date browser support tables for individual features

Duplicate named capturing groups

(2022) - Ex:

Extended mode and comments

(2021) - Flag ( ) with insignificant whitespace and line comments ( ), plus inline comments via

Pattern modifiers

(2021) - Ex: , ,

Atomic operators

(2021) - Atomic groups via and possessive quantifiers (ex: , )

Buffer boundaries

(2021) - Anchors and , not affected by flag

\R escape

(2021) - Outside character classes, matches any line terminator

Restrict subclassing support in built-ins

(2020) - Scaled back subclassing

RegExp escaping

(2015) -

Legacy RegExp features

(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

(2006) by Jeffrey Friedl - A computer science classic, best for people who already know the basics. Includes good coverage of crafting efficient regexes

(2012) by Michael Fitzgerald - An intro for programmers new to regular expressions that sticks to the basics

and a on optimization - Introduction to writing a non-backtracking regex engine (in JavaScript)

Influential people behind the technology

Advanced usage of a .NET-only regex feature

Chrome extension: - Regex search on webpages via

Quiz: - Requires sign-in

Games: , , ($)

Comics: ,