Real-Time Regex Tester: Debug & Validate Text Patterns Efficiently
Test and debug regular expressions in real time with this powerful regex tester. Features pattern matching, syntax highlighting, common regex examples, and a comprehensive reference guide. Perfect for developers validating text patterns.
Match Results
Common Patterns
Quick Reference
^: Start of line\n$: End of line\n\b: Word boundary\n\B: Not word boundary\d: Digit [0-9]\n\w: Word [A-Za-z0-9_]\n\s: Whitespace\n.: Any character except newlineFrequently Asked Questions
Regular expressions (regex) are powerful pattern matching tools used to search, validate, and manipulate text. They provide a flexible way to describe complex text patterns using a special syntax.
1. Enter your regex pattern in the top field
2. Select any flags you need (g, i, m, etc.)
3. Enter your test text in the large field
4. Click "Test Regex" to see matches highlighted
5. Use the quick reference and examples for help
2. Select any flags you need (g, i, m, etc.)
3. Enter your test text in the large field
4. Click "Test Regex" to see matches highlighted
5. Use the quick reference and examples for help
• Forgetting to escape special characters
- Not using proper anchors (^ and $)
- Incorrect character class usage
- Overuse of greedy quantifiers
- Not testing edge cases
- Not using proper anchors (^ and $)
- Incorrect character class usage
- Overuse of greedy quantifiers
- Not testing edge cases
• Practice with different patterns
- Study the quick reference guide
- Try the common patterns examples
- Test your patterns with various inputs
- Experiment with different flags
- Study the quick reference guide
- Try the common patterns examples
- Test your patterns with various inputs
- Experiment with different flags
• g (global): Find all matches
- i (case-insensitive): Ignore case
- m (multiline): Change ^ and $ behavior
- y (sticky): Match from position
- u (unicode): Unicode support
- i (case-insensitive): Ignore case
- m (multiline): Change ^ and $ behavior
- y (sticky): Match from position
- u (unicode): Unicode support
About Regular Expressions
Regular expressions (regex) are powerful text pattern matching and manipulation tools used in programming, text processing, and data validation.
Common Use Cases:
- Form validation (emails, phones, passwords)
- Data extraction and parsing
- Search and replace operations
- Text processing and formatting
- Input validation and sanitization