Regex Tester
FreeTest and debug regular expressions with live matching and highlighting
Options
About Regex Tester
Regular expressions are powerful but unforgiving, and a single misplaced character can make a pattern match everything or nothing. Rather than guessing why your expression fails, you need to see exactly what it catches against real sample text. This tool lets you test and debug regex patterns with live matching, so highlights appear as you type.
Enter your pattern and some sample text, and matches light up immediately so you can refine the expression until it behaves. It runs entirely in your browser with no signup and no watermark, and your patterns and text are never uploaded. Whether you are validating input, extracting data, or learning regex, it gives you instant feedback in a free, private workspace.
Common uses
- Debugging why a validation pattern rejects valid email or phone formats
- Building a regex to extract specific values from a block of log text
- Testing a search-and-replace pattern before using it in code or an editor
- Learning how character classes and quantifiers behave with live highlighting
- Confirming a pattern matches all the edge cases in your sample data
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- 100% Free — no account needed
- Works in your browser — no software required
- Instant results
- Secure and private
- No data stored
- Simple to use
FAQ
Does it highlight matches as I type?
Yes. Matches in your sample text are highlighted live, so you can see the effect of every change to your pattern immediately.
Can I test capture groups?
You can write patterns with capture groups and see what they match in the sample text, which helps when you need to extract specific parts.
Is my test text private?
Yes. Both your pattern and sample text are processed in the browser and are not stored or uploaded.
Can I use Regex Tester on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.