Regex Tester
This regex tester is an essential tool for developers. Use it to format code, validate data, or transform content. All processing happens locally in your browser - your code never leaves your device.
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How It Works
- Enter your regex pattern on first line (e.g., /^[a-z]+$/i)
- Paste the test text in the box below
- Click "Process" to see matches
- Review captured groups
Use Cases
- Developing validation logic
- Extracting data from logs
- Learning regular expressions
- Debugging complex patterns
Frequently Asked Questions
Which flavor is used?
This tool uses the JavaScript Regex engine.
Do I need slashes?
Yes, if you want flags (like /g or /i), wrap your pattern in slashes. If you just type a pattern, it is treated as new RegExp("pattern").
Does it support lookbehinds?
Yes, modern browsers support lookbehinds, but support varies in older environments.
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