Regex Tester
Test your regular expressions against a string to find matches and captures.
Key Features
Flag Support
Global, case-insensitive, and multiline flags
Capture Groups
Detailed capture group analysis and highlighting
Secure Processing
All processing happens locally in your browser
Related Coding Tools
Frequently Asked Questions
What is a Regex Tester?
A Regex Tester allows you to test and debug regular expressions in real time to see how they match strings, identify capture groups, and validate pattern accuracy.
Does this tool support regex flags?
Yes, you can use global (g), case-insensitive (i), and multiline (m) flags to modify how your regular expression matches text.
Is this tool free to use?
Yes, this Regex Tester is completely free and runs directly in your browser with no registration required.
Is my data stored on the server?
No, everything runs locally in your browser. Your code and input never leave your device, ensuring complete privacy and security.
What regex features are supported?
This tool supports all standard JavaScript regex features including character classes, quantifiers, anchors, groups, lookaheads, and all common flags.
Can I test complex regex patterns?
Yes, the tool handles complex patterns including nested groups, alternations, and advanced regex constructs. Results show full matches and individual capture groups.
How do I interpret the results?
Results show each match with the full matched text and individual capture groups. Match numbers and group indices help you understand which parts of your pattern matched.
Are there any keyboard shortcuts?
Yes, you can use Ctrl+Enter (Cmd+Enter on Mac) to test your regex quickly without clicking the test button.