Regex Tester & Debugger
Test and debug regular expressions in real time. See matches highlighted, capture groups extracted, and get plain English explanations.
Examples
Email addresses
In:\b\w+@\w+\.\w+\b
IP addresses
In:\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b
Hex colors
In:#[0-9a-fA-F]{3,6}\b
//g
How to Use Regex Tester & Debugger
- Enter your regular expression pattern in the pattern field.
- Set the desired flags (global, case-insensitive, multiline).
- Type or paste the test string you want to match against.
- Matches are displayed instantly with their positions and capture groups.
What is a Regex Tester?
A regex tester lets you write and test regular expressions against sample text in real time. You can see all matches highlighted, inspect capture groups, and verify that your pattern works correctly before using it in your code.
Regular expressions are supported in virtually every programming language and are essential for tasks like input validation, text parsing, log analysis, and data extraction.