dvcrn Regex Playground
Interactive regular expression learning and testing tool.
Usage
regex "pattern" "test string"
Features
- 🎯 Real-time matching
- 📖 Plain English explanation
- 🔍 Match groups extraction
- 📋 Common patterns library
- 🧪 Test cases generator
Example
Input: regex "(\w+)@(\w+)\.(\w+)" "test@example.com"
Output:
✓ Match: test@example.com
Group 1: test
Group 2: example
Group 3: com
Explanation:
- (\w+) - capture word characters (test)
- @ - literal @
- (\w+) - capture word characters (example)
- \. - literal dot
- (\w+) - capture word characters (com)
Common Patterns
| Pattern | Meaning | Example |
|---|---|---|
\d+ |
One or more digits | 123 |
\w+ |
Word characters | hello_123 |
[a-z] |
Letter range | a, b, c |
^start |
Starts with | start... |
end$ |
Ends with | ...end |
| `a | b` | OR |
a* |
Zero or more a | '', a, aaa |
a+ |
One or more a | a, aaa |
Commands
regex explain <pattern>- Explain pattern in plain Englishregex test <pattern> <string>- Test pattern against stringregex library- Show common patternsregex generate <type>- Generate test cases (email, url, phone, etc.)
Use Cases
- Debug regex in code
- Learn regex by seeing matches
- Validate input patterns
- Extract data from strings