Regex Tester — Free Online Tool

Real-time regular expression tester with match highlighting, groups, and detailed match information. Regex Tester is a free online tool from the ToolsRift JavaScript Tools collection. It runs entirely in your browser — nothing to install, no signup, and your data never leaves your device.

Loading Regex Tester…

How to use Regex Tester

  1. Open the Regex Tester above — it loads instantly, no account needed.
  2. Enter or upload your input. Everything is processed locally on your device.
  3. Get your result immediately and copy or download it with one click.

Frequently asked questions

How does the regex tester work?

Enter your regex pattern and test string. Matches are highlighted in real-time, and you can see all matches, groups, and indices.

What regex flags are supported?

Common flags like g (global), i (case-insensitive), m (multiline), s (dotall), and u (unicode) are supported.

Can I test JavaScript-specific regex?

Yes, the tester uses JavaScript's regex engine, so all JavaScript regex features including lookbehinds and named groups work correctly.

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