Skip to content
Day 53: new resources are added every day. See what's new

Web App

regex101

An online tester that builds, explains and debugs regular expressions.

Visit regex101Free4.8

Built with love by Shushant Lakhyani. Building bestproductivityresources.com

What is regex101?

regex101 is a free online tool for writing and testing regular expressions with live matching and a plain-language explanation of each part. It supports flavours such as PCRE2, JavaScript, Python, Go, Java and .NET, and lets you save and share patterns with a link.

Pros

  • Explains every part of a pattern
  • Supports many regex flavours
  • Shareable saved patterns

Cons

  • Can feel busy for beginners
  • Some extras need a free account

Who should use regex101

Developers and analysts who write or debug regular expressions.

Who may not need it

People who never work with text patterns or code.

regex101 alternatives

Similar resources to regex101, picked from the directory.

Webapp Testing Skill

Focus: claude, claude skills and playwright. Shares testing and debugging with regex101. An AI tool, not a web app. Adds macOS, Windows and Linux. Same 4.8 rating.

AI ToolFreeWeb, macOS

Insomnia Mockbin

Focus: api, mock server and http. Shares testing and debugging with regex101. Rated 4.6 (regex101: 4.8).

Web AppFreeWeb

Scribe AI

Focus: AI, Automation and Documentation. Also in Workflows and Learning, like regex101. Freemium (regex101: Free). Adds Chrome, Windows and macOS. Rated 4.7 (regex101: 4.8).

Web AppFree planWeb, Chrome

VibeIndex

Focus: vibe coding, ai coding tools and directory. Shares testing and developer tools with regex101. A website, not a web app. Rated 4.6 (regex101: 4.8).

WebsiteFreeWeb

AI Canvas

Focus: react, shadcn and components. Also in Workflows and Learning, like regex101. Freemium (regex101: Free). Rated 4.4 (regex101: 4.8).

Web AppFree planWeb

Emulate

Focus: api emulation, ci and open source. Shares testing and developer tools with regex101. A framework, not a web app. Rated 4.4 (regex101: 4.8).

FrameworkFreeCross-Platform

Free alternatives to regex101

Free resources that cover similar ground.

Shoogle

Focus: shadcn, ui components and search. Also in Workflows and Learning, like regex101. Rated 4.4 (regex101: 4.8).

Web AppFreeWeb

The Art of Command Line

Focus: command line, terminal and bash. Also in Learning and Workflows, like regex101. A course, not a web app. Adds macOS, Linux and Windows. Rated 4.9 (regex101: 4.8).

CourseFreeWeb, macOS

AI Agents for Beginners

Focus: ai agents, microsoft and course. Also in Learning and Workflows, like regex101. A course, not a web app. Same 4.8 rating.

CourseFreeWeb

CyberChef

Focus: data conversion, encoding and open source. Shares developer tools with regex101. Adds Offline. Same 4.8 rating.

Web AppFreeWeb, Offline

navi

Focus: terminal, cli and cheatsheet. Also in Workflows and Learning, like regex101. A desktop app, not a web app. Adds macOS, Windows and Linux. Same 4.8 rating.

Desktop AppFreemacOS, Windows
Are you the maker of regex101?Get a free Featured badge for your site, a share image and ready-to-paste posts. No sign-up.

Free Notion database

1,100+ ways people are making money online

Real online businesses, creators and projects, broken down by how they make money: apps, online stores, AI tools and more. Free on Gumroad.

Get the free database

Free Notion database

399+ ways to make money online

Hundreds of online income methods in one place, so you can compare options and pick one to try. Free on Gumroad.

Get the free list

For research and ideas only. Results vary and nothing here is a promise of income. See our Disclaimer.

Weekly newsletter

New tools and visual guides, every Monday.

One short email a week with the best new tools and websites, plus my latest visual guides. Free, and you can unsubscribe anytime.

Join the newsletter

You sign up on Gumroad, which stores your email to send the newsletter. See our Privacy Policy.

Live traffic, fully public

This site's analytics are open for everyone to see.

Open dashboard