Online Regex Tester and Debugger
Test your regular expressions in real-time with our powerful Regex Tester and Debugger tool. Perfect for developers, data analysts, and anyone working with text processing. Supports JavaScript regex syntax with full highlighting of matches and groups.
Regex Cheat Sheet
| Pattern | Description |
|---|---|
| \d | Digit (0-9) |
| \w | Word character (a-z, A-Z, 0-9, _) |
| \s | Whitespace (space, tab, newline) |
| . | Any character except newline |
| [abc] | Any of a, b, or c |
| [^abc] | Not a, b, or c |
| ^ | Start of string |
| $ | End of string |
| * | 0 or more repetitions |
| + | 1 or more repetitions |
| {3} | Exactly 3 repetitions |
| {3,5} | 3 to 5 repetitions |
| (abc) | Capture group |
| a|b | a or b |
Master Regular Expressions with Our Online Regex Tester
Regular expressions (regex) are powerful pattern-matching tools used across programming languages and text processing applications. Our online Regex Tester and Debugger provides an intuitive interface to test and refine your patterns in real-time.
Why Use Our Regex Tester?
- Instant Feedback: See matches highlighted as you type with detailed match information
- Full Feature Support: Test all JavaScript regex features including lookaheads, groups, and quantifiers
- Performance Metrics: View execution time to optimize complex patterns
- Replacement Tool: Test string replacement patterns with group references
- No Installation Needed: Works entirely in your browser with no server-side processing
Common Regex Use Cases
Regular expressions are invaluable for:
- Data Validation: Verify email formats, phone numbers, passwords
- Text Search: Find complex patterns in documents or code
- Data Extraction: Pull specific information from logs or reports
- Text Manipulation: Find and replace patterns in bulk
- Syntax Highlighting: Power code editors and markup processors
Regex Learning Resources
New to regular expressions? Start with simple patterns like \d+ (one or more digits) or [A-Z][a-z]* (capitalized words). Practice with our tester and consult the cheat sheet for common patterns. As you advance, explore more complex concepts like non-capturing groups (?:...) and lookarounds (?=...).
Bookmark this page for quick access to your regex testing needs. Share your patterns with colleagues by simply copying the URL - your input is preserved in the browser!
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