Regular expression tester

Inspect JavaScript regex matches in a time-limited worker.

How it works and limits

Uses the browser’s JavaScript RegExp syntax. Results include matched text, UTF-16 start index and captured groups. Maximum 1,000 matches; computation stops after a short time limit. Flags are optional. No replacement or remote execution.

Worked example

pattern: [A-Z][a-z]+
flags: g
source: Ada and Grace build tools.

Inputs start empty. Load example fills them only when you choose it. Reset clears inputs and results.

This tool runs locally. When enabled, Google manages regional privacy choices. Google code can access this page and its inputs.

Regular expression tester

Source

Output