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Test and debug regular expressions online with real-time matching. Fast, secure, and 100% browser-based.
Regex Tester
Test regular expressions and debug capture groups instantly.
Test String
Match Results
Enter a regular expression and test string to see matches
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Why use our Regex Tester?
Real-time Testing
See matches instantly as you type your regex pattern or test string.
Capture Groups
Clearly see all capture groups extracted from your matched strings.
Secure & Private
All regex testing happens in your browser. Your data is never uploaded to any external server.
Regex Flags
Easily toggle flags like global (g), case-insensitive (i), multiline (m), and more.
What is a Regular Expression?
How to Test Regex Patterns
Frequently Asked Questions
What is a regular expression (regex)?
A regular expression is a sequence of characters that specifies a search pattern in text. It's used by string-searching algorithms for 'find' or 'find and replace' operations.
Is this tool safe for sensitive data?
Yes. This Regex Tester is 100% client-side. Your regular expressions and test strings are never sent to any server, making it completely safe for sensitive data.
What regex engine does this use?
This tool uses the standard JavaScript (ECMAScript) regular expression engine built into your web browser.
How do I use capture groups?
Wrap a part of your pattern in parentheses like (pattern). The captured content will appear under the Match Results section.