Regex Tester
Test regular expressions with live match highlighting, capture groups, and substitution.
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Enter a regex pattern to see matches.
Frequently Asked Questions
- What regex flavor does this use?
- JavaScript's built-in RegExp engine, which follows the ECMAScript standard. Compatible with JavaScript, TypeScript, and many other languages.
- Can I test multiline regex?
- Yes. Enable the 'm' flag for multiline mode where ^ and $ match line boundaries, and 's' flag for dotAll mode where . matches newlines.
- Is this tool free to use?
- Yes, completely free. No account, no subscription, no hidden limits.
- Are my files safe? Do you upload them?
- Your files never leave your device. All processing runs locally in your browser using JavaScript — nothing is sent to any server.
- Does it work on mobile?
- Yes, it works on all modern browsers including mobile Safari and Chrome on iOS and Android.