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Regular expression

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.

https://github.com/piotrjustyna/fontbot

Choose word, choose font, tweet. Twitter bot written in Haskell.

font haskell regular-expression timeline tweets twitter

Last synced: 19 May 2026

https://github.com/k4m4/sha-regex

Regular expression for matching SHA hashes in strings.

hash matcher regex regex-match regular-expression sha

Last synced: 10 Jun 2025

https://github.com/sulami/rx

Standalone version of Emacs' rx macro

emacs regex regular-expression rust

Last synced: 22 Apr 2025

https://github.com/oswaldobapvicjr/jep-data-extension

An extension of the Java Expression Parser library with useful functions for data handling

data-manipulation java jep jsonpath regular-expression xpath

Last synced: 08 May 2025

https://github.com/tiaanduplessis/colors-regex

Regular expressions for rgb, rgba, hex, hexa, hsl & hsla colors

colors-regex hexa hsl hsla-colors regular-expression rgba

Last synced: 08 Aug 2025

https://github.com/elrizwiraswara/regexed_text

This package extends the Text widget to provide additional functionality for highlighting text that matches a given list of RegExp patterns.

highlight link regular-expression text text-style

Last synced: 15 Jun 2025

https://github.com/maykon-oliveira/regex-tutorial

:bulb: Learn how to use and get the most out of regular expressions.

javascript regex regexp regexp-search regular-expression tutorial

Last synced: 02 Aug 2025

https://github.com/pwwang/regexr

Regular expressions for humans

regex regular-expression regular-expressions

Last synced: 31 Jan 2026

https://github.com/smimram/regrade

Simple grading system using regular expressions.

assignment grade homework ocaml regular-expression

Last synced: 12 Feb 2026

https://github.com/thaliaarchi/re1-rust

A port of re1, Russ Cox’s simple, virtual machine–based regular expression engine

regular-expression

Last synced: 11 Feb 2026

https://github.com/meniny/re

🔫 Pythonic RegEx library.

python pythonic re regex regexp regular-expression swift

Last synced: 18 May 2026

https://github.com/tushararora/regexer

Web extension for Firefox to quickly check matches in a string against a regular expression.

firefox firefox-addon firefox-extension javascript regular-expression

Last synced: 10 Aug 2025

https://github.com/gusenov/xls-formula-eval-java

Java-библиотека для вычисления Excel-формул.

excel expression-evaluator formula-parser java java-library regular-expression xls

Last synced: 20 Feb 2026

https://github.com/luketowers/oc-twigpcre-plugin

Twig PCRE Filters / Functions for OctoberCMS

octobercms octobercms-plugin php plugin regex regular-expression twig

Last synced: 09 Apr 2025

https://github.com/luciopaiva/cols-and-rows

When grep is not enough... transform text input, line by line, using regular expressions.

console-tool grep regular-expression text-processing

Last synced: 21 Mar 2025

https://github.com/cnlon/regexp.online

To learn & test Regular Expression online

javascript regex regexp regular-expression

Last synced: 23 Jul 2025

https://github.com/philpennock/emailsupport

Golang routines and variables useful when dealing with email

email-validation go regular-expression

Last synced: 18 Mar 2025

https://github.com/sinkaroid/nhentaish

bash nhentai downloader

bash doujinshi nhentai regular-expression

Last synced: 14 Oct 2025

https://github.com/LukeTowers/oc-twigpcre-plugin

Twig PCRE Filters / Functions for OctoberCMS

octobercms octobercms-plugin php plugin regex regular-expression twig

Last synced: 12 Apr 2025

https://github.com/ahkhanjani/regez

RegEz is a RegEx generator for coding regular expressions in JavaScript.

javascript regex regex-generator regexp regular-expression regular-expressions typescript

Last synced: 27 Jan 2026

https://github.com/li-boxuan/regex-checker

GitHub App that checks Pull Request titles using user-defined regular expression

continuous-integration github github-app probot-app regular-expression

Last synced: 17 May 2026

https://github.com/bryanwilhite/blog

My source files for my technical Blog entries—an 11ty-based fire hose 🚒 for a static web site

11ty c-sharp csharp json markdown regex regular-expression static-site-generator

Last synced: 07 Oct 2025

https://github.com/mottie/is-regexp-string

Check if a string is a regular expression

check node regexp regular-expression string

Last synced: 26 Apr 2026

https://github.com/Mottie/is-regexp-string

Check if a string is a regular expression

check node regexp regular-expression string

Last synced: 27 Jul 2025

https://github.com/e-spin/form-regex-bundle

With the extension, a new text field is available in the form generator, where a Individual input check via Regular Expression (Regex) and a message is displayed in the event of an error.

contao form regex regular-expression

Last synced: 19 Jan 2026

https://github.com/urigoren/nre

Nice Regular Expressions

regular-expression

Last synced: 15 Jul 2025

https://github.com/jpmhouston/renamecommand

A ParsableArguments implementation for making minimal rename scripts in Swift

argumentparser command-line regular-expression rename-script swift swift-package-manager swift-sh

Last synced: 16 Jul 2026

https://github.com/vaeth/pyrep

Search and/or replace regular expressions within many files interactively

regular-expression replace-in-files replace-text

Last synced: 26 Mar 2025

https://github.com/kernix13/pre-code-formatter

JavaScript output of selected code with span color classes for a pre code block.

blog codeblocks pre-tag regex regular-expression regular-expressions

Last synced: 19 Mar 2026

https://github.com/gpalleschi/pyexpresso

A Visual Tool to check regular expression written in Python using Kivy GUI framework, it permits test expressions, save expression on file and load expression from a file.

kivy kivy-framework python regular-expression regular-expressions

Last synced: 04 Jan 2026

https://github.com/inspect-js/has-named-captures

Does the JS environment support named capture groups in regexes?

capture group javascript named regex regular-expression regular-expressions

Last synced: 07 Oct 2025

https://github.com/yuqingc/lxa

Lexical analysis/Regular expression engine written in TypeScript

compiler lexical-analysis regular-expression regular-expression-engine

Last synced: 17 Mar 2025

https://github.com/rangoo94/object-regexp

Match regular expressions on list of objects

formula js-engine objects parser quantifiers regexp regular-expression

Last synced: 26 Mar 2025

https://github.com/aidinhamedi/python-color-print-v2

A simple and user friendly way to print colored text to the console.

color colorfu colorprint print python python3 regular-expression

Last synced: 06 Apr 2025

https://github.com/mooseburger1/2015-twitter-airline-sentiment-analysis

Performing sentiment analysis of airlines from Twitter Data.

matplotlib numpy pandas-dataframe python3 regular-expression

Last synced: 09 May 2026

https://github.com/basemax/iranian-phonenumber-validator-nodejs

A library for validating Iranian phone numbers in nodejs that can help you to extract all phone numbers from a text, check if a text has a phone number, check if a text is exactly a phone number, check if a text includes a special phone number.

iran iranian javascript js node nodejs phone-number phone-number-validation phone-number-validator phonenumber phonenumber-validation phonenumber-validator regex regex-pattern regular-expression regular-expressions validate validator validators

Last synced: 01 May 2026

https://github.com/frsource/frs-replace

The fastest way to replace any text/file/piped stream content. Shipped with both NodeJS API & CLI out of the box!

cli command-line-interface fast frs-replace javascript nodejs performance pipe pipes regex regexp regular-expression replace replacement stream streams

Last synced: 18 May 2026

https://github.com/hlysine/readable-regexp

Regular Expressions - quick and concise, readable and composable.

readable regex regexp regular-expression regular-expressions typescript

Last synced: 10 May 2026

https://github.com/hex7c0/safer-regex

detect possibly exponential-time regular expressions (with cli support)

cli nodejs regex regular-expression

Last synced: 26 Feb 2026

https://github.com/dohliam/portable-regex

A regular expression tool with live-updating search and replace

grep regex regular-expression test-regex

Last synced: 18 Mar 2026

https://github.com/pschiffmann/verbose-regexp.dart

Simulates verbose flag behavior for regular expressions in Dart.

dart regular-expression

Last synced: 22 Feb 2026

https://github.com/teneplaysofficial/registration-and-login-system-cpp

A C++ project that provides user registration with email and password, featuring email validation using regular expressions, password length validation, and secure password management with options for resetting passwords. Future plans include implementing a cipher algorithm for enhanced data protection.

cipher-algorithm cpp emailvalidation fstream login-system regular-expression string xor-cipher

Last synced: 22 Jun 2026

https://github.com/chandansoren/medical-data-extraction

Medical data extraction from medical documents like prescription and patient details document using python and Regex

fastapi ocr-recognition opencv-python pdf2image pytesseract python regular-expression

Last synced: 06 May 2026

https://github.com/kevinokerlund/dom-regex

JavaScript library for querying DOM elements with Regular Expressions.

dom dom-regex javascript-library queryselector regular-expression

Last synced: 08 Aug 2025

https://github.com/tiaanduplessis/sa-company-registration-number-regex

Regular expression for matching South African Company Registration Number

company-registration regular-expression south-africa

Last synced: 08 Aug 2025

https://github.com/kei-k23/g-grep

G-grep is a small regular expression (regex) engine that is written in Go

go regex regular-expression

Last synced: 07 Mar 2026

https://github.com/yanivmo/ruler

Humane formal grammar library for Python

grammar regex regular-expression

Last synced: 22 Mar 2025

https://github.com/jabhij/py-regularexpressionx

Everything you need to know about Regular Expression in python for scientific work, especially related to Data Science.

python regex regular-expression

Last synced: 29 May 2026

https://github.com/serpent7776/rer

regular expression based file renamer

commandline regex regular-expression rename rename-files utility

Last synced: 11 Mar 2025

https://github.com/skordal/ada-regex

A simple regular expression engine

ada ada-2012 regular-expression state-machine syntax-tree

Last synced: 29 Jun 2026

https://github.com/rafael-santiago/here

A tiny C-library that implements regular expressions.

c minimalist-library regular-expression

Last synced: 10 Oct 2025

https://github.com/mohaphez/linux-tutorial-tricks

Here I‍ note all I know about linux commands , tricks, and what I have from experiences.

bash linux linux-commands linux-tutorial regular-expression tutorial vim

Last synced: 19 Apr 2026

https://github.com/regexhq/floating-point-regex

Regular expression for matching floating-point literals.

floating-point number regex regexp regular-expression

Last synced: 09 Mar 2026

https://github.com/zadean/xs_regex

XML Schema Regex for Erlang

erlang regex regular-expression xml xml-schema xpath xquery

Last synced: 28 Oct 2025

https://github.com/redkenrok/node-planckmatch

Small and simple matching library using glob patterns.

glob-pattern match matching regular-expression

Last synced: 05 Apr 2025

https://github.com/auvred/regonaut

ES2025-compatible ECMAScript RegExp engine implemented in Go

ecmascript go javascript js regex regex-engine regexp regular-expression regular-expression-engine

Last synced: 14 Apr 2026

https://github.com/jaid/test-string

Checks if a string matches given string, RegExp or function.

library match regex regexp regular-expression string strings test util utility validate validation

Last synced: 31 Oct 2025

https://github.com/zeqiang-lai/visualization-of-regx2dfa

Java program that converts regular expression to DFA.

dfa java nfa regular-expression visualization-tools

Last synced: 22 Mar 2025

https://github.com/hugoalh/url-regexp-es

An ES (JavaScript & TypeScript) module for URL regular expression.

es javascript js modulejs regexp regular-expression ts typescript url

Last synced: 22 Mar 2025

https://github.com/raghul-m/data-analysis-with-jupyternotebook-python

This repository consists of notebooks where I learned the basics of getting started with data analysis using Python libraries

beautifulsoup4 data-analysis-python eda jupyter-notebook matplotlib-python numpy pandas-python regular-expression seaborn-python webscraping

Last synced: 19 May 2026

https://github.com/basemax/email-validator-nodejs

This is a simple email validator for NodeJS that can match all emails in a string, check if a string has an email address, or check if a string includes a specific email address. You can use this module to validate emails in your NodeJS projects.

email email-validate email-validator javascript javascript-regex js js-regex regex regex-javascript regex-js regular-expression regular-expression-javascript regular-expression-js regular-expressions validator

Last synced: 27 Jul 2025

https://github.com/shinnn/exif-date-regex

A regular expression to validate and parse Exif date format

date ecmascript exif javascript lookbehind-assertion named-capture regular-expression validation

Last synced: 01 Aug 2025

https://github.com/ascentis/mssql-regex

Simple package allowing to use CLR RegEx within MSSQL

clr-regex dotnet mssql mssql-database mssql-regex regex regular-expression

Last synced: 30 Oct 2025

https://github.com/dohliam/elements-of-a-in-b

Find matching strings in two columns using regular expressions

columns javascript matches regex regular-expression tiny-tools

Last synced: 21 Mar 2025

https://github.com/massigy/ll1p.go

This is a simple LL(1) grammar tokenizer & parser written in Go.

go-programming-language golang grammar-parser language-theory ll1-grammar ll1-parser parser regular-expression tokenizer

Last synced: 10 Aug 2025

https://github.com/gyumeijie/regexp

A quick regular expression cheatsheet by examples.

cheatsheet regular-expression

Last synced: 13 Feb 2026

https://github.com/ajhsu/regextract

Extracting text with Regular Expression

javascript regexp regular-expression

Last synced: 17 Aug 2025

https://github.com/msthamizh/bizcardx-extracting-business-card-data-with-ocr

Developing a Streamlit application that enables users to upload business card images and extract key details using easyOCR. The app allows users to manage the extracted data (view, update, delete) and securely stores it in a MySQL database. It also highlights extracted text directly on the business card image using Pillow.

easyocr mysql numpy pandas pillow python regular-expression streamlit

Last synced: 10 Apr 2026

https://github.com/systemjargon/regex

Regular Expression aka regex. Some examples like, match, find, replace. Mix of usage, bash, powershell, notepad++

regex regexp regular-expression

Last synced: 09 Jul 2026

https://github.com/jqueryscript/regex

An awesome collection of useful and commonly used Regular Expressions to make life easier.

regex regex-pattern regular-expression regular-expressions

Last synced: 12 Mar 2025

https://github.com/jhonatanit/parameters-medical-records

Transform unstructured, potentially faulty OCR output into a structured Python list of dictionaries.

ocr python regular-expression

Last synced: 27 Mar 2025

https://github.com/pavi2410/rgxstr

Regex Star ⭐ Generate strings from patterns - regex, glob

generator glob pattern regex regular-expression string

Last synced: 22 Mar 2025

Regular expression Awesome Lists
Computer-Science-Resources 51 awesome-regex 153
Regular expression Categories
Content 92 Regex engines 51 JavaScript regex evolution 24 JavaScript regex libraries 22 Testers 21 Performance 17 Tutorials 11 Grep-like tools 7 Visualizers 6 About 5 Syntax-free regex builders 4 Articles 3 Books 3 Miscellaneous 3 Communities 2 Collections of patterns 2 Miscelaneous 1