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Free tool
Regex Tester
Test a regular expression against sample text — see matches highlighted inline and captured groups listed below. Runs entirely in your browser.
Pattern capped at 300 characters, test string at 3,000 — this also limits how long a runaway pattern (catastrophic backtracking) could hang your own browser tab. Matching stops after 1,000 results. Nothing is sent anywhere; this all runs locally.
Need custom data extraction at scale?
We build web scrapers and data pipelines that go well beyond a single regex.