Regex Tester
Test regular expressions against text. See matches and highlighted results live.
Pattern & test string
Examples:
Output
Matches (0)
Enter a pattern and test string to see matches.
Highlighted test string
Test string will appear here with matches highlighted.
What is a Regex Tester?
A regex tester allows you to test regular expressions against text in real time. It helps you match patterns, extract data, and validate input.
Enter a pattern and a test string to instantly see which parts match. This tool runs entirely in your browser — no data is sent to a server.
Why use this regex tester?
Regular expressions can be difficult to debug. This tool shows matches instantly so you can refine patterns faster.
Common regex examples
- Email validation
- Extracting numbers from text
- Matching URLs
- Removing whitespace
How to use
Enter your regex pattern and test string. Matches are highlighted instantly. Adjust flags like global or case-insensitive as needed.