regex tester - Brave Search

regex101: build, test, and debug regex

Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.

Learn regex and challenge yourself in a unique regex quiz: play progressively harder levels and compete with others in creating the shortest solutions.

Community Patterns

Search, filter and view user submitted regular expressions in the regex library. Over 20,000 entries, and counting!

Regular expression tester with syntax highlighting, explanation, cheat sheet for PHP/PCRE, Python, GO, JavaScript, Java, C#/.NET, Rust.

RegExr: Learn, Build, & Test RegEx

Regular expression tester with syntax highlighting, PHP / PCRE & JS Support, contextual help, cheat sheet, reference, and searchable community patterns.

Videos

A quick regular expression tester / RegEx tester utility - YouTube

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

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

September 4, 2025

Regular Expressions (RegEx) Tutorial #13 - Testing a RegEx Pattern ...

VS Code Hidden Gems: Regex Match Preview + More! - YouTube

November 8, 2023

JavaScript Regex: Mastering the test() Method for Beginners - YouTube

September 5, 2025

Discussions

Online Regex tester and debugger for multiple languages - One of my favourite sites!

I'm partial to RegExr , though from a quick skim they don't seem too different in features. More on reddit.com

r/programming

116

1202

August 15, 2019

Self hostet website for regex testing

You can self host RegExr, the GitHub link (https://github.com/gskinner/regexr/) to it is in the upper right of the site. I self-host it myself.

More on reddit.com

r/selfhosted

8

1

April 2, 2019

RegEx wizards, how did you learn RegEx and how did you get it to stick?

https://regex101.com is what I use. More on reddit.com

r/learnprogramming

120

932

July 16, 2019

regextester.com

Regex Tester and Debugger Online - Javascript, PCRE, PHP

Regular Expression Tester with highlighting for Javascript and PCRE. Quickly test and debug your regex.

regexstorm.net › tester

.NET Regex Tester - Regex Storm

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

regextester.github.io

Regular Expresstion Tester

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

Regex Tester - Javascript, PCRE, PHP

Test your Javascript and PCRE regular expressions online.

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

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

Find elsewhere

Google Bing Mojeek

openreplay.com › tools › regex-tester

A Regex Tester allows you to validate and test regular expressions against a given string.

jam.dev › utilities › regex-tester

Regex Tester & Playground | Free, Open Source & Ad-free

Interactive regex playground with pattern explanation, capture group visualization, and preset patterns. Test your regular expressions quickly and easily with Jam's free online Regex Tester.

leogtzr.medium.com › how-to-quickly-test-your-regular-expressions-6acc3c6dbfaf

How to quickly test your Regular Expressions | by Leo Gutiérrez | Medium

June 19, 2021 - Whichever result you pick, it should work, I always pick the first result, right now is https://regex101.com/

tatum.io › regex-tester

Regex Tester by Tatum

Free regex tester with syntax highlighting. Tatum's regural expression tester includes explanation feature and a cheat sheet.

developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › RegExp › test

RegExp.prototype.test() - JavaScript | MDN

The test() method of RegExp instances executes a search with this regular expression for a match between a regular expression and a specified string. Returns true if there is a match; false otherwise.

AnalyticsMarket

analyticsmarket.com › freetools › regex-tester

Google Analytics Regular Expression Tester - AnalyticsMarket

August 1, 2023 - This tool lets you test regular expressions (RegEx), used in Google Analytics Filters. Test the RegEx in a sandbox property before applying it elsewhere.

activityinfo.org › support › docs › regex › test.html

Regular expression tester - ActivityInfo: information management software for M&E, reporting and case management

The following tools gives you a quick way to test regular expression for data quality · Enter a regular expression pattern here to match

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.

piliapp.com › regex-tester

Regex Tester · javascript php python · / / [?] preg_match_all re.DOTALL re.IGNORECASE re.LOCALE re.MULTILINE re.VERBOSE re.UNICODE ·

reddit.com › r/programming › online regex tester and debugger for multiple languages - one of my favourite sites!

r/programming on Reddit: Online Regex tester and debugger for multiple languages - One of my favourite sites!

August 15, 2019 - Hopefully Claude/ChatGPT has solved generating the right regex for us now ! But anyway they too get it wrong sometimes, so better to test it. I use https://onlinequicktool.com/regex-tester/ to quickly validate llm's response.

goteleport.com › resources › tools › regex-tester

RegEx Tester | Instantly Validate Your RegEx Patterns | Teleport

Instantly test and analyze your regex patterns with this free online tool. Validate patterns, highlight matches, and debug effortlessly.

Splunk Community

community.splunk.com › t5 › Splunk-Search › Online-interactive-regular-expression-tester-for-Splunk-regular › m-p › 83068

Online, interactive regular expression tester for Splunk regular expressions?

March 21, 2025 - It allows you test out some regular expressions, with some of your actual data. This is achieved with a simple "copy and paste" of you data into the window provided on the webpage. You can type in your own regex, or you can use the right-hand pane to look through the various "samples" if you are unsure.

retool.com › utilities › regex-tester

RegEx Tester | Retool

Regular expression (RegEx) tester to validate RegEx with syntax highlighter using this free tool.