What is RegExr?
RegExr is an online tool to learn, build and test regular expressions. It highlights matches as you type and shows a hover explanation for each token in your pattern.
A built-in cheat sheet and reference make it beginner friendly, and a community library has thousands of patterns you can search and reuse.
Key features
- Live match highlighting
- Hover explanations for each token
- Cheat sheet and full reference
- Community pattern library
Pros
- Great for learning regex
- Clean and friendly
- Lots of reusable examples
Cons
- Only JavaScript and PCRE flavors
- No step-by-step debugger
Best for
Learning regular expressionsFinding a ready-made patternTesting JavaScript regex
Ratings and reviews
No reviews yet. Community ratings and reviews are coming soon, so you can share how RegExr worked for you.
RegExr FAQ
Is RegExr free?
RegExr is free and open source with no account needed to test.
Do I need an account to use RegExr?
No. RegExr works without signing up, so you can open regexr.com and start using it right away.
What are some alternatives to RegExr?
Similar free tools that also work without an account include Regex101, CyberChef, Crontab Guru, Transform, JSON Crack and Carbon.