regular-expressions

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Aregular expression (shortened asregex orregexp), 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.

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pemistahl /grex

Star8k

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

UpdatedJan 14, 2026
Rust

rust-lang /regex

Star3.9k

An implementation of regular expressions for Rust. This implementation uses finite automata and guarantees linear time matching on all inputs.

rust automata regex regexp nfa automaton regular-expressions dfa regex-engine regex-syntax regex-parser

UpdatedFeb 3, 2026
Rust

learnbyexample /py_regular_expressions

Star1.8k

Learn Python Regular Expressions step by step from beginner to advanced levels

python regex ebook exercises learning-by-doing regular-expressions

UpdatedDec 15, 2025
Python

justmarkham /DAT8

Star1.6k

General Assembly's 2015 Data Science course in Washington, DC

python data-science machine-learning natural-language-processing course clustering naive-bayes linear-regression scikit-learn jupyter-notebook pandas data-visualization web-scraping data-analysis ensemble-learning logistic-regression decision-trees regular-expressions data-cleaning model-evaluation

UpdatedJun 5, 2024
Jupyter Notebook

subethaedit /SubEthaEdit

Star1.4k

General purpose plain text editor for macOS. Widely known for its live collaboration feature.

syntax-highlighting macos shell html mac objective-c osx code ide collaboration desktop-application text-editor developer-tools cocoa macosx appkit mit-license regular-expressions collaborative-editing creative-writing

UpdatedNov 9, 2025
Objective-C

LeonardoCardoso /SwiftLinkPreview

Star1.4k

It makes a preview from an URL, grabbing all the information such as title, relevant texts and images.

url macos swift flow website ios crawler tvos watchos cocoapods carthage swift-package-manager preview regular-expressions relevant-texts

UpdatedJan 18, 2025
Swift

gherkins /regexpbuilderphp

Star1.3k

🦉 human-readable regular expressions

php regex regular-expression regular-expressions human-readable

UpdatedDec 19, 2025
PHP

mazen160 /secrets-patterns-db

Star1.3k

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

UpdatedAug 6, 2025
Python

google /re2j

Star1.2k

linear time regular expression matching in Java

java regular-expressions

UpdatedJan 9, 2025
Java

codingforentrepreneurs /Guides

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Star1.2k

Guides for learning + doing better web and app development. Created by Coding for Entrepreneurs.

python heroku windows macos linux setup raspberry-pi django linode django-framework digital-ocean entrepreneurs regular-expressions guides raspberry-pi-django webfaction

UpdatedFeb 11, 2021

chrdavis /SmartRename

Star710

A Windows Shell Extension for more advanced bulk renaming using search and replace or regular expressions

windows rename shell-extension rename-files regular-expressions filename windows-shell windows-explorer bulk-rename

UpdatedFeb 1, 2026
C++

lorey /social-media-profiles-regexs

Star646

📇 Extract social media profiles and more with regular expressions

github instagram snapchat facebook twitter telegram phone regex linkedin skype scraping hackernews profiles regular-expressions angellist social-media-profiles

UpdatedJan 11, 2024
Python

Genivia /RE-flex

Star580

Yet another high-performance C++ regex library and lexical analyzer generator like Flex: extends Flex++ with Unicode support, indent/dedent anchors, lazy quantifiers, functions for lex and syntax error reporting and more. Seamlessly integrates with Bison and other parsers.

bison flex compiler regex regular-expression fuzzy-matching lex pcre lexer lexer-generator regex-pattern regular-expressions graphviz-dot lexical-analyzer regex-library regex-engine flex-regex

UpdatedJun 19, 2025
C++

fancy-regex /fancy-regex

Star578

Rust library for regular expressions using "fancy" features like look-around and backreferences. Has a mode which aims to be compatible with Oniguruma syntax.

regex regular-expressions