Runs locally
Regex Tester
Highlights matches and capture groups.
Export and import are available after you sign in. Sign in
Runs in your browser against the text you provide. Pattern and text length are limited.
About this tool
Build and debug regular expressions before putting them in code. Type the pattern and flags, paste sample text, and every match is highlighted as you type.
How to use it
- 01
Type the regular expression.
- 02
Set flags such as g, i or m.
- 03
Paste the text and review the highlighted matches.
FAQ
Frequently asked questions
Which regex flavor is used?
JavaScript regular expressions, the same engine your browser and Node.js use.
Is there a size limit?
Pattern and text length are limited so a runaway expression cannot freeze the page.