regex online - Brave Search

regex101: build, test, and debug regex

Online regex tester and debugger with real-time match highlighting, detailed explanations, substitutions, unit tests, benchmarking, and code generation. Supports PCRE2, JavaScript, Python, Go, Java, .NET, Rust, POSIX ERE, and POSIX BRE.

RegExr: Learn, Build, & Test RegEx

RegExr is an online tool to learn, build, & test Regular Expressions (RegEx / RegExp).

Videos

Learn Regex Online: Basic Tryouts with Regex101 for Beginners - ...

Learn REGEX - This Tool Makes It Almost TOO EASY 😏 - YouTube

Learn Regular Expressions In 20 Minutes - YouTube

October 29, 2019

Regular Expressions (Regex) - Visually Explained - YouTube

Regex Testing Tools for Beginners: regex101 & regexr Tutorial - ...

September 4, 2025

People also ask

What is regex?

Regex is short for *regular expression* - a compact pattern language for matching text. The same idea exists in almost every programming language and many editors and command-line tools.

coddy.tech › tools › regex tester

Regex Tester Online - Test Regular Expressions Live | Coddy

Is JavaScript regex the same as every other regex?

The basics are the same, but engines differ. JavaScript, PCRE, Python re, Java, Go, and .NET each support slightly different flags and advanced features (lookbehind support, named groups, possessive quantifiers).

coddy.tech › tools › regex tester

Regex Tester Online - Test Regular Expressions Live | Coddy

How do I write a regex?

Start with the literal characters you want to match, then replace the variable parts with character classes (\d, \w, [abc]) and quantifiers (*, +, ?, {n,m}). Use a regex tester to iterate until the pattern matches exactly the cases you want.

coddy.tech › tools › regex tester

Regex Tester Online - Test Regular Expressions Live | Coddy

regexstorm.net › tester

.NET Regex Tester - Regex Storm

Online .NET regular expression tester with real-time highlighting and detailed results output.

openreplay.com › home › developer toolbox › regex tester

Regex tester | OpenReplay

Test and debug regular expressions with live match highlighting, capture groups and indices. Free and processed locally in your browser.

w3schools.com › tools › tool_regex.php

RegEx Tester - W3Schools

Test regular expressions against text with real-time matching and group capture.

RegexOne - Learn Regular Expressions - Lesson 1: An Introduction, and the ABCs

RegexOne Learn Regular Expressions with simple, interactive exercises.

regexplanet.com

The Regex Zone is the place to share regular expressions and find common regex patterns.

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coddy.tech › tools › regex tester

Regex Tester Online - Test Regular Expressions Live | Coddy

April 25, 2026 - Free online regex tester with live match highlighting, capture groups, and flags. Build and debug JavaScript regex patterns in your browser.

Regex Generator

regex-generator.olafneumann.org

Regex Generator - Creating regex is easy again!

A tool to generate simple regular expressions from sample text. Enable less experienced developers to create regex smoothly.

trackingplan.com › regex-tester

Regex Tester Online: Test & Validate Regular Expressions | Trackingplan

Test and validate your regular expressions with our Online Regex Tester. Supports JavaScript, TypeScript, and more. Try our Regex Checker and Validator.

regextester.github.io

Regular Expression Tester for .Net, Python, Java and JavaScript

fossa.com › resources › devops-tools › regex-tester

Regex Tester | Free DevOps Tool | FOSSA

Free online regex tester and debugger with syntax highlighting, real-time matching, and detailed match information. Test and validate regular expressions instantly.

Regex Learn - Step by step, from zero to advanced.

You can easily manage your data with Regex, which uses commands like finding, matching, and editing. Regex can be used in programming languages such as Python, SQL, JavaScript, R, Google Analytics, Google Data Studio, and throughout the coding process. Learn regex online with examples and tutorials ...

Regular Expression Tester

Online regex tester. Full highlighting of regex syntax. Very useful. Javascript regex used.

phpliveregex.com

Test PHP regular expressions live in your browser and generate sample code for preg_match, preg_match_all, preg_replace, preg_grep, and preg_split!

regexplanet.com › advanced › java › index.html

Java regex testing - RegexPlanet

Online testing for Java (java.util.regex.Pattern) regular expressions.

developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Regular_expressions

Regular expressions - JavaScript | MDN

An online visual regex tester.

Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.

Test your regex by visualizing it with a live editor. JavaScript, Python, and PCRE.

Regular expression visualizer using railroad diagrams

Regex Tester - Javascript, PCRE, PHP

Test your Javascript and PCRE regular expressions online.