Regex Playground

Learn, test, and debug regular expressions with real-time matching, explanations, and common patterns. Perfect for developers learning regex or debugging complex patterns.

Interactive regular expression learning and testing tool.

Usage

text

regex "pattern" "test string"

Features

• 🎯 Real-time matching
• 📖 Plain English explanation
• 🔍 Match groups extraction
• 📋 Common patterns library
• 🧪 Test cases generator

Example

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Input: regex "(\w+)@(\w+)\.(\w+)" "[e-mail]"

Output:
✓ Match: [e-mail]
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 English
• regex test <pattern> <string> - Test pattern against string
• regex library - Show common patterns
• regex 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