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RegExr.com is an online tool to learn, build, and test Regular Expressions.

replit
StackBlitz
CloudShell
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CodeTasty
AWS Cloud9
Gitpod
GItHub Codespaces is a hosted remote coding environment by GitHub based on Visual Studio Codespaces integrated directly for GitHub.

Which is more popular?
Based on our record, RegExr should be more popular than GitHub Codespaces. It has been mentioned 368 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | regexr.com | github.com |
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| Company | Startup from the United States | — |
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Beginners who want to try their luck can use GitHub Codespaces for free with limited benefits, but you will have enough features to carry on. If you are a team or an enterprise, you can start using GitHub Codespaces...
Recommendations tracked on public social media and blogs since March 2021.


Use Online Tools: There are many online regex testers and visualizers that can help you see how your patterns match against sample text. These tools often provide explanations for each part of the regex. I personally use... - Source: dev.to / over 1 year ago
However - here it becomes weird - when testing the original regex rule (the first one, without the \u00A0 part) on the same string in an interactive visualiser (https://regexr.com/ for instance), there is a match:. - Source: dev.to / almost 2 years ago
Learned regex in the 90's from the Perl documentation, or possibly one of the oreilly perl references. That was a time where printed language references were more convenient than searching the internet. Perl still includes a shell... - Source: Hacker News / about 2 years ago
First, remote dev environments became table stakes. GitHub Codespaces, Gitpod, and self-hosted dev containers became how serious teams worked. Every engineer I know who ships to production now SSHs into a box they didn't provision, edits... - Source: dev.to / 5 months ago
This package provides support for managing GitHub Codespaces in Emacs and connecting to them via TRAMP. It provides a handy completing-read UI that lets you choose from all your created codespaces. - Source: dev.to / 7 months ago
GitHub Codespaces provides 60 hours of free compute time every month, which is more than enough for scoped home assignments or interviews. It’s a full VSCode in the browser at github.dev or vscode.dev. - Source: dev.to / 10 months ago
When comparing RegExr and GitHub Codespaces, you can also consider the following products.

Extensive regex tester and debugger with highlighting for PHP, PCRE, Python and JavaScript.
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Code, create, andlearn together. Use our free, collaborative, in-browser IDE to code in 50+ languages — without spending a second on setup.
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Online VS Code Editor for Angular and React
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The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
Compare Expresso to RegExr or GitHub Codespaces:

Cloud Shell is a free admin machine with browser-based command-line access for managing your infrastructure and applications on Google Cloud Platform.
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