Is this regex tester free to use?

Yes, it is 100% free with no sign-up, no limits, and no ads required. All regex testing happens instantly in your browser.

What regex flags are supported?

The tool supports the standard JavaScript flags: g (global match), i (case-insensitive), and m (multiline). Toggle them on or off to see how each flag affects your matches.

Does it show match positions?

Yes. Every match displays its index number, the matched content, and the character position where it was found in the text. The total match count is shown at the top.

Is there a regex cheat sheet?

Yes. The tool includes a built-in regex reference with 15 commonly used patterns including email, phone number, URL, IP address, date formats, Chinese characters, and more — each with a one-click insert.

Free Online Regex Tester & Debugger

Q: Does this tool send my data to a server?

No. All regex matching and text processing runs locally in your browser using JavaScript's native RegExp engine. Nothing is ever uploaded.

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Match Results

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Regex Cheat Sheet

How It Works

Test and debug your regular expressions in three simple steps

Enter Your Regex

Type a regular expression in the top input field, delimited by forward slashes. Toggle the g, i, and m flags as needed.

Paste Test Text

Add your sample text in the main text area. Matches are highlighted instantly with yellow markers as you type.

Review Results

Check the match list on the right for details — index, content, and position. Use the cheat sheet to grab common patterns.

Frequently Asked Questions

Common questions about our regex testing tool

Yes, it is 100% free with no sign-up, no usage limits, and no ads. All regex testing happens instantly in your browser.

No. All regex processing runs locally in your browser using JavaScript's native RegExp engine. Your text and patterns never leave your device.

The tool supports three standard JavaScript RegExp flags: g (global — find all matches), i (case-insensitive), and m (multiline — ^ and $ match line boundaries). Click toggle buttons to enable or disable each flag.

Yes. The results panel shows every match with its sequential index number, the full matched content, and the character position where the match begins. The total match count is displayed above the text area.

Yes. The tool includes a built-in reference panel with 15 commonly used regex patterns — email, phone, URL, IP address, date formats, Chinese characters, and more. Click any pattern to instantly insert it into the regex input field.