Validate, debug, and visualize regular expressions with the free RegEx Tester tool from CodeTap.org. Whether you're writing JavaScript, PHP, Python, or any language that supports regex, this tool helps you test your patterns in real time.
✅ Live regex matching with instant feedback
✅ Highlight matches directly in test strings
✅ Supports flags (g, i, m, s, u, etc.)
✅ Detailed error handling and explanation
✅ Clean, distraction-free interface
✅ Works entirely in your browser
From quick pattern checks to complex debugging, this tool simplifies your regex workflow. It supports most common regex flavors and provides results as you type—no need to reload or submit.
Everything runs in your browser. Your data stays local—no servers, no logging, and no upload required.
Validating input formats (emails, phone numbers, etc.)
Extracting data with pattern-based matching
Learning and experimenting with regex syntax
Debugging complex regex patterns in a safe environment
Use the RegEx Tester at CodeTap.org to save time, avoid frustration, and master regular expressions faster than ever.
A RegEx (Regular Expression) Tester is a tool that lets you write, test, and debug regular expressions in real-time. It matches patterns against input text to help with validation, search, and data extraction.
You can test any standard RegEx pattern, including email validation, phone numbers, URLs, HTML tags, IP addresses, dates, and more. The tool also supports modifier flags like i, g, m, etc.
Yes. Matches are highlighted instantly, and capturing groups are displayed so you can easily see what your pattern is capturing.
Absolutely! Our tool is perfect for both beginners and advanced users. It includes example patterns, syntax hints, and instant feedback to help you learn RegEx faster.
No. All testing happens locally in your browser, and your data is never stored or sent to any server. Your privacy is 100% protected.