Regex

Regex Tester

Test a JavaScript regular expression locally and see match status, counts, text, positions and capture groups.

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Matches

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Uses your browser’s JavaScript RegExp engine. Positions and lengths are zero-based UTF-16 code units; end positions are exclusive. Without g, matching returns only the first match. Sticky y starts at position 0.

Limits: 16,384 pattern code units, 200,000 text code units, 2,000 matches or split parts, and 4,000,000 output code units. User regex execution requires a local worker with a 1,500 ms timeout. Oversized results fail rather than being truncated.

Processed locally in your browser. Inputs and results are not uploaded or saved by this page.

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What does this tool do?

Test a JavaScript regular expression locally and see match status, counts, text, positions and capture groups. Code Station Regex tools use the JavaScript regular expression engine. Inputs: Regex Pattern, Test text, Flags. Outputs: Matches, Match count, Match status, Capture groups.

How to use it?

Enter a JavaScript pattern and test text, then select any flags. Choose “Test regex”, then copy individual result values if needed. Clear removes all inputs and results and restores option defaults.