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Regex Tester — Live Match Highlighting

Test regular expressions live in your browser. Highlights matches, shows capture groups, supports all JavaScript regex flags.

//g
Email me at hello@7busyboss.com or support@example.org

Match details

#MatchIndexGroups
1hello@7busyboss.com12—
2support@example.org35—
About this tool

Regex without the suffering

Type your pattern, your test string, toggle the flags you need (g, i, m, s, u). Matches are highlighted in real time and a table shows every match with its index and capture groups.

How to use the Regex Tester

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Regex Tester above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Regex Tester.

Is the Regex Tester free to use?

Yes. The Regex Testeron 7BusyBoss is completely free — no signup, no paywall, no usage cap. We do recommend paid alternatives in a sidebar card, but the core tool stays free.

Do I need to sign up to use the Regex Tester?

No. The Regex Testerworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Regex Tester work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Regex Tester?

Yes. The Regex Testerruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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