What is Regex101?
Regex101 is an online tester for regular expressions. Type a pattern and some test text, and it highlights every match and capture group in real time while explaining each part of the pattern in plain English.
It supports the PCRE, JavaScript, Python, Go, Java, .NET and Rust flavors, has a debugger that steps through how the engine matches, and can generate code for your language.
Key features
- Live matching with capture group highlighting
- Plain-English explanation of the pattern
- Multiple regex flavors
- Debugger, code generator and community library
Pros
- Best-in-class explanations
- Supports the flavor you actually use
- Great for learning and debugging
Cons
- Saving to a personal library needs an account
- The dense interface takes a moment to learn
Best for
Ratings and reviews
No reviews yet. Community ratings and reviews are coming soon, so you can share how Regex101 worked for you.
Regex101 FAQ
Is Regex101 free?
Regex101 is free with no account needed for testing. Saved regex can be shared by link.
Do I need an account to use Regex101?
No. Regex101 works without signing up, so you can open regex101.com and start using it right away.
What are some alternatives to Regex101?
Similar free tools that also work without an account include CyberChef, Crontab Guru, Transform, JSON Crack, Carbon and Ray.so.