UtilSnapDeveloperRegex Tester

Regex Tester

Test regular expressions with live match highlighting. All JavaScript regex flags are supported.

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How to test regular expressions online

  1. Enter your regex pattern and optional flags (g, i, m, s).
  2. Paste sample text to match against.
  3. Review highlighted matches and capture groups in real time.

Related tools: JSON Formatter, JWT Decoder

Frequently asked questions

Which regex flavor is supported?

JavaScript regular expressions as implemented by your browser's ECMAScript engine — the same regex used in Node.js and browser JavaScript.

Is test data uploaded?

No. Matching and highlighting run locally in your browser.

Is the regex tester free?

Yes. Free, no sign-up, no limits.

Can I test regex with multiple flags?

Yes. Combine flags like g (global), i (case-insensitive), m (multiline), and s (dotAll) to match your use case.