Interactive Regex Tester
Welcome! A Regular Expression (regex) is a sequence of characters that forms a search pattern. Use this tool to write, test, and understand regex patterns live.
Enter your pattern, provide a test string, select flags, and see the matches in real-time.
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Regular Expression Pattern
Type your regex pattern here (e.g., \d+ for numbers, or cat for the word "cat").
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Flags modify the search behavior. Hover over each flag for a detailed description.
Test String
Enter text to test your regex pattern against. Matches will be highlighted below.
Results
Ready to Test
Enter a regex pattern above to start testing.
Matches will be displayed here with detailed analysis.