About Our Live Regex Tester & Debugger

This free online tool allows you to test, debug, and visualize your regular expressions in real-time. As you type your regex pattern and test string, the matches will be highlighted instantly. This is a great tool for developers, students, and anyone learning regex who needs to write and test regular expressions quickly and efficiently.

Your Privacy Matters

We believe in privacy. All the regex testing and data manipulation happens directly in your browser. We do not store any of your regular expressions or test strings on our servers. Your data is your own.

What is a Regular Expression (Regex)?

A regular expression (or "regex") is a sequence of characters that defines a search pattern. They are used to match character combinations in strings. In JavaScript, regular expressions are also objects. These patterns are used with the exec and test methods of RegExp, and with the match, replace, search, and split methods of String.

How to Use This Tool

1. Enter your regular expression in the "Regular Expression" input field.
2. Select the flags you want to use (g, i, m).
3. Enter the string you want to test your regex against in the "Test String" text area.
4. The results will be shown in the "Results" panel, with the matches highlighted in the "Live Match Highlighting" section and detailed information in the "Match Information" section.
5. You can use the "Generate Shareable Link" button to create a unique URL for your regex and test string, so you can share it with others.
6. Click on the "Visualize" tab to see a graphical representation of your regular expression. This can help you understand how your regex works and debug any issues.