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

Git
Your safety net for AI coding

Which is more popular?
Based on our record, RegExr seems to be more popular. 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 | shadowgit.com |
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| Platforms | — | |
| Company | Startup from the United States | Startup from Germany · 1 - 9 employees · 2025 |
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In their own words, as submitted to SaaSHub.


No description of RegExr yet.
Every change saved. Any version restorable. AI can search what changed to debug faster. Never lose work again. Cut debugging time by 80%. Save 50% on AI tokens. 100% local.
What each product offers, as listed by its team.


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As answered by people managing RegExr and ShadowGit.
ShadowGit's answer:
ShadowGit is the only tool where AI assistants can directly search your code history to debug faster while using 50% fewer tokens. Auto-captures every change without touching your main git repo. Built specifically for AI-assisted development.
ShadowGit's answer:
Electron is the primary technology being used.
ShadowGit's answer:
ShadowGit is the only tool built specifically for developers using AI. Unlike generic backup tools, your AI can actually search the history to debug faster and use 50% fewer tokens. Separate shadow repo means your main git stays clean. 100% local.
ShadowGit's answer:
AI-Accelerated solo developers that use AI coding assistants daily (Claude, Cursor, Copilot), experienced enough to feel the pain (2-10 years of coding) and that want to move fast, ship often and experiment constantly.
ShadowGit's answer:
I built ShadowGit after losing 3 hours of work to a bad AI refactor. Started as a personal backup tool, but when I added MCP integration so AI could search the history, debugging time dropped 80%. Had to share it.
Share your experience with using RegExr and ShadowGit. For example, how are they different and which one is better?
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
Tracking ShadowGit since Sep 2025.
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Git is a free and open source version control system designed to handle everything from small to very large projects with speed and efficiency. It is easy to learn and lightweight with lighting fast performance that outclasses competitors.
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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 ShadowGit:

RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.
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Welcome to the fantastic world of nerdy regex fun!
Compare Regex Crossword to RegExr or ShadowGit: