How to use the Regex Tester?

Enter your Regular Expression pattern. Paste the test string you want to match. View highlighted matches and capturing groups. Check the "Match Information" sidebar for details.

Is this Regex Tester free to use?

Yes, this tool is 100% free and works directly in your web browser without requiring any software downloads.

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Regex Tester & Debugger

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Test String

Match Results

Matches will be highlighted here...

0 matches found Processing is done locally in your browser.

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info How to Use

1

Enter your Regular Expression in the top bar (e.g. [a-z]+).
2

Set flags like g (global), i (case insensitive), or m (multiline).
3

Type in the "Test String" box. Matches are highlighted instantly.

star Features

check_circle Real-time Testing: See matches update as you type.
check_circle Visual Highlighting: Distinctly highlights matched patterns in yellow.
check_circle Error Reporting: Shows helpful error messages for invalid regex patterns.