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Regex tester online — test regular expressions with real-time highlighting and match details.

Regex Tester

Free tool by NJ Cloud Printer

Test regular expressions with real-time match highlighting. Supports flags, replace mode, and match details. Free. No login.

Pattern

Test Text

Results (0 matches)

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Frequently Asked Questions

What regex engine does this use?

This tool uses JavaScript's built-in RegExp engine, which is ECMAScript-compliant.

What regex flags are supported?

Supported flags include g (global), i (case-insensitive), m (multiline), s (dotall), and u (unicode).

Can I test regex replacement?

Yes, you can enter a replacement string to see how matches are replaced in the text.