Regular expression tester

Test a regex pattern against text and see matches and capture groups.

Flags

Matches run in a separate worker with a time limit, so a slow pattern cannot freeze the page. The pattern and text stay in this browser.

How to use

  1. Enter a pattern and choose flags.
  2. Paste the test text.
  3. Review the matches.

What it supports

Runs in an isolated worker that stops after 2 seconds, so heavy patterns cannot freeze the page. Pattern up to 2,000 characters, text up to 200,000.

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