Online Regex Tester for Developers
Validate and debug your regular expressions with our comprehensive Regex Tester. Support for multiple programming languages including JavaScript, Python, and PHP. Enjoy syntax highlighting, real-time feedback, and a user-friendly interface to streamline your regex development process.
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