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.

Audits

Pass

ClawScanPass

Agentic behavior and permission review.

Static analysisPass

Pattern checks against bundled files.

VirusTotalPass

Multi-engine malware detections and file reputation.

Install

openclaw skills install regex-playground

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 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