JavaScript Regex Tester

Test a JavaScript regular expression and inspect match text, positions and capture groups.

Test text

Pattern (without / delimiters)

Flags

Runs in an isolated browser worker for at most one second and returns up to 200 matches.

How to use

Enter test text and a pattern without surrounding slashes.

Set JavaScript flags such as g or i.

Run the pattern and inspect up to 200 matches.

Enter test text and a pattern without surrounding slashes. Set JavaScript flags such as g or i. Run the pattern and inspect up to 200 matches.

It uses the JavaScript RegExp implementation in your browser. Match positions are UTF-16 string offsets.

The pattern runs in a separate browser worker. A one-second timeout terminates it; text is limited to 50,000 characters.

Tool inputs are processed in your browser. Advertising makes separate requests as described in the privacy policy.