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Best Productivity ResourcesBy Shushant LakhyaniVerified creator

Web App

RegExr

Learn, build and test regular expressions with live feedback.

Visit RegExr4.7

  • Rating

    4.7 / 5

  • Pricing

    Free

  • Difficulty

    Intermediate

  • Works on

    Web

Built with love by Shushant Lakhyani. Building bestproductivityresources.com

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What is RegExr?

RegExr highlights matches as you type a regular expression, explains each part of the pattern and includes a cheat sheet and community patterns. It is free and open source, supports JavaScript and PCRE flavours, and lets you save and share patterns.

Pros: what RegExr does well

  • Plain-English pattern explanations
  • Live match highlighting
  • Built-in cheat sheet

Cons: where it falls short

  • Fewer regex flavours than some tools
  • Saving needs an account

Who RegExr is for

Developers and learners who want to understand and debug regular expressions.

Who can skip it

People who never work with text patterns.

RegExr alternatives

Not sold on RegExr? These do a similar job, and each card says what it has in common.

All Learning resources

regex101

Focus: debugging. Shares regex and developer tools with RegExr. Rated 4.8 (RegExr: 4.7).

Web AppFreeWeb
4.8Visit

Regexper

Focus: diagrams and debugging. Shares regex and developer tools with RegExr. Rated 4.6 (RegExr: 4.7).

Web AppFreeWeb
4.6Visit

DevDocs

Focus: documentation, api reference and open source. Shares developer tools with RegExr. Adds Offline. Same 4.7 rating.

Web AppFreeWeb, Offline
4.7Visit

JWT.io

Focus: jwt, authentication and debugging. Shares developer tools with RegExr. Rated 4.6 (RegExr: 4.7).

Web AppFreeWeb
4.6Visit

The Missing Semester

Focus: command line, git and mit. Shares developer tools with RegExr. A course, not a web app. Rated 4.8 (RegExr: 4.7).

CourseFreeWeb
4.8Visit

Free alternatives to RegExr

Want to spend nothing? These free picks cover similar ground.

Collect UI

Focus: ui inspiration, design gallery and components. Shares patterns with RegExr. A website, not a web app. Rated 4.4 (RegExr: 4.7).

WebsiteFreeWeb
4.4Visit

Webapp Testing Skill

Focus: claude, claude skills and playwright. Shares testing and developer tools with RegExr. An AI tool, not a web app. Adds macOS, Windows and Linux. Rated 4.8 (RegExr: 4.7).

AI ToolFreeWeb, macOS
4.8Visit

JupyterLab

Focus: notebooks, python and data science. Also in Learning and Workflows, like RegExr. Adds macOS, Windows and Linux. Same 4.7 rating.

Web AppFreeWeb, macOS
4.7Visit

CSS Grid Generator

Focus: css grid, layout and front end. Also in Learning and Workflows, like RegExr. Rated 4.6 (RegExr: 4.7).

Web AppFreeWeb
4.6Visit

Layoutit Grid

Focus: css grid, layout and generator. Also in Learning and Workflows, like RegExr. Rated 4.6 (RegExr: 4.7).

Web AppFreeWeb
4.6Visit
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