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Regular expression

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A regular expression (shortened as regex or regexp), sometimes referred to as rational expression, is a sequence of characters that specifies a match pattern in text. Usually such patterns are used by string-searching algorithms for “find” or “find and replace” operations on strings, or for input validation.

Regular expression techniques are developed in theoretical computer science and formal language theory. They are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Regular expressions are also supported in many programming languages.

Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax.

Here are 1,761 public repositories matching this topic...

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ziishaned / learn-regex

Star 46.1k

Learn regex the easy way

regex regular-expression learn-regex
  • Updated Aug 25, 2025

tindy2013 / subconverter

Star 17.1k

Utility to convert between various subscription format

emoji gist ssr rename regular-expression clash surge v2ray ss quantumult surfboard quantumultx clashr subconverter
  • Updated Jul 9, 2026
  • C++
grex

pemistahl / grex

Star 8.3k

A command-line tool and Rust library with Python bindings for generating regular expressions from user-provided test cases

python rust cli terminal tool regex regexp python-library regular-expression regex-pattern command-line-tool rust-library regular-expressions rust-crate rust-cli
  • Updated Feb 27, 2026
  • Rust

CJex / regulex

Star 5.8k

🚧 Regular Expression Excited!

javascript typescript diagram regex regexp regular-expression regulex
  • Updated Jul 12, 2022
  • TypeScript

VincentSit / ChinaMobilePhoneNumberRegex

Star 4.8k

Regular expressions that match the mobile phone number in mainland China. / 一组匹配中国大陆手机号码的正则表达式。

phone-number regex regular-expression china-mobile mainland-china china-unicom china-telecom
  • Updated May 17, 2022
melody

yoav-lavi / melody

Star 4.7k

Melody is a language that compiles to regular expressions and aims to be more readable and maintainable

language rust compiler regex regexp regular-expression melody melodylang
  • Updated Nov 24, 2024
  • Rust
magic-regexp

unjs / magic-regexp

Star 4.3k

A compiled-away, type-safe, readable RegExp alternative

typescript regex regexp regular-expression hacktoberfest
  • Updated Nov 11, 2026
  • TypeScript
compile-time-regular-expressions

hanickadot / compile-time-regular-expressions

Sponsor
Star 3.9k

Compile Time Regular Expression in C++

awesome constexpr regular-expression pcre header-only cpp17 compile-time cpp20 template-udl
  • Updated Sep 11, 2026
  • C++

slevithan / xregexp

Sponsor
Star 3.3k

Extended JavaScript regular expressions

regex regexp regular-expression
  • Updated Sep 24, 2026
  • JavaScript

micromatch / micromatch

Star 3k

Highly optimized wildcard and glob matching library. Faster, drop-in replacement to minimatch and multimatch. Used by square, webpack, babel core, yarn, jest, ract-native, taro, bulma, browser-sync, stylelint, nyc, ava, and many others! Follow micromatch's author: https://github.com/jonschlinkert

javascript bash node regex glob regular-expression matcher glob-pattern glob-matching multimatch minimatch wildcard micromatch extglob node-glob globbing extended-glob wildmat globby tidelift
  • Updated Aug 26, 2024
  • JavaScript

the-akira / Computer-Science-Resources

Star 2.8k

Collection of resources spanning key areas of Computer Science

javascript python programming-language machine-learning cryptography database networking physics assembly regular-expression mathematics artificial-intelligence operating-system computer cybersecurity quantum-computing exploits cloud-computing awesome-list computervision
  • Updated Sep 19, 2025

kkos / oniguruma

Star 2.5k

regular expression library

c regexp regular-expression
  • Updated Apr 24, 2025
  • C
cheat-sheet-pdf

sk3pp3r / cheat-sheet-pdf

Star 2.5k

📜 A Cheat-Sheet Collection from the WWW

python vim cheat-sheets linux slack bash docker nginx redis jenkins pdf ansible ai powershell regex regular-expression ci-cd cheatsheet devops-tools cheat-sheet
  • Updated May 25, 2025
  • HTML

VerbalExpressions / PHPVerbalExpressions

Star 2.4k

PHP Regular expressions made easy

regular-expression verbalexpressions
  • Updated Jun 13, 2020
  • PHP

mattnotmax / cyberchef-recipes

Star 2.2k

A list of cyber-chef recipes and curated links

incident-response malware regular-expression dfir data-manipulation cyberchef cyberchef-recipes
  • Updated Jun 14, 2024

mathiasbynens / emoji-regex

Sponsor
Star 1.9k

A regular expression to match all Emoji-only symbols as per the Unicode Standard.

emoji unicode regex regexp regular-expression
  • Updated Sep 15, 2026
  • JavaScript

fent / randexp.js

Star 1.9k

Create random strings that match a given regular expression.

testing node regular-expression
  • Updated Nov 6, 2026
  • TypeScript

SimpleRegex / SRL-PHP

Star 1.8k

Simple Regex Language

composer regular-expression query-builder composer-packages srl
  • Updated Sep 2, 2022
  • PHP

mazen160 / secrets-patterns-db

Star 1.6k

Secrets Patterns DB: The largest open-source Database for detecting secrets, API keys, passwords, tokens, and more.

regex regular-expression secrets regular-expressions trufflehog gitleaks secrets-detection trufflehog3
  • Updated Aug 6, 2025
  • Python

Water-Melon / Melon

Star 1.5k

A generic cross-platform C library that includes many commonly used components and frameworks, and a new scripting language interpreter. It currently supports C99 and Aspect-Oriented Programming (AOP).

c http json framework base64 interpreter algorithms multiprocessing c99 regular-expression multithreading md5 data-structures thread-pool sha1 sha256 aop reedsolomon memory-pool cipher-algorithms
  • Updated May 30, 2026
  • C

Created by Stephen Cole Kleene

Released 1950

Followers
36 followers
Website
github.com/topics/regular-expression
Wikipedia
Wikipedia

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awk glob grep pattern-matching sed wildcard
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