Regex Tester & Validator
Test and validate regular expressions with real-time matching and highlighting. Perfect for pattern validation and regex development.
Regular Expression Pattern
Valid
//
Test String
Matches (0)
No matches found
Highlighted Text
Here are some sample email addresses to test:
john.doe@example.com
jane_smith@company.org
invalid-email@
test123@domain.co.uk
user+tag@service.io
not-an-email-address
admin@localhost
support@website.net
This text contains both valid and invalid email patterns for testing the regex.
Regex Flags
g (global): Find all matches, not just the first one
i (ignore case): Case-insensitive matching
m (multiline): ^ and $ match line breaks
s (dotall): . matches newline characters
About Regex Tester
The Regex Tester helps you develop, test, and validate regular expressions with real-time feedback. See matches highlighted in your test text and debug regex patterns efficiently.
Features:
- Real-time Testing - See matches as you type
- Syntax Validation - Immediate error feedback
- Match Highlighting - Visual match identification
- Capture Groups - View captured group values
- Flag Support - Global, case-insensitive, multiline modes
Common Use Cases:
- Email address validation
- Phone number formatting
- URL pattern matching
- Data extraction and parsing
- Input validation for forms