Regex Tester Online Free
Test and debug regular expressions with live match highlighting. Includes Indian patterns (PAN, mobile, PIN).
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About Regex Tester & Debugger Online
Test and debug regular expressions in real time with live match highlighting. Includes pre-built patterns for Indian mobile numbers, PAN cards, email, PIN codes, URLs and more.
Regex Tester & Debugger Online is a free, browser-based utility that requires no login, no signup, and no installation. All processing happens entirely within your web browser using JavaScript — your data never leaves your device. The tool works on all screen sizes including mobile phones, tablets, and desktop computers.
How to use
- Enter your values in the input fields — results update instantly as you type.
- No submit button needed. The tool calculates in real time.
- Copy your result or share it via WhatsApp or Twitter using the buttons above.
- Use the workflow links below to chain into related tools for a complete task.
- All processing is browser-only. Nothing you enter is sent to any server.
Tool details
⚡ Next step — complete your workflow
Frequently asked questions
What regex flags are available?
g (global), i (case-insensitive), m (multiline), s (dotall), u (unicode). Most common: gi for global case-insensitive search.
Regex for Indian mobile number?
/[6-9]\d{9}/ matches valid Indian mobile numbers starting with 6, 7, 8, or 9 followed by 9 digits.
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