Regex Tester
Test regular expressions live: every match position, captured groups and a replacement preview, with support for the g, i and m flags.
Runs in your browser: input and output are never sent to the server, and the platform does not store your input.
Output
Fill in the fields on the left, then run.
How to use
- 1Enter your pattern and flags.
- 2Paste the text to test against.
- 3Add a replacement string to preview the result.
FAQ
Which flavour of regex is this?
JavaScript's RegExp engine, so the syntax matches Node.js and the browser.
Can the replacement use groups?
Yes — use $1, $2 for captured groups, or $<name> for named groups.
Why are there no matches?
Check whether you need the g flag, and whether special characters are escaped correctly.