Regex tester
Test a JavaScript regular expression against text, with match groups and flags explained.
Details and questions
Features
- Matches and capture groups listed live
- Flags and syntax errors shown clearly
- Cheat sheet of common tokens built in
How to use
- Open the tool you need.
- Paste input on the left or into the input box.
- Read and copy the result; nothing is uploaded.
Questions
Is my data uploaded?
No. Every tool runs locally in your browser; pasted text stays on this device.
Is there a usage or length limit?
There is no account and no quota; the practical limit is the memory of this device.
What is DevZero?
DevZero is a set of local developer text tools — encoding, hashing, time, regex and more, usable offline.