Regular Expression Tester & Debugger

Test JavaScript and PCRE regular expression patterns against sample text strings. Inspect match indices, capture groups, and pattern flags in real time.

Key Features

• Real-time match highlighting and count
• Support for global (g), case-insensitive (i), multiline (m), and dotAll (s) flags
• Capture groups detail table
• Presets for common patterns (Email, URL, IP Address, Phone Number)

Frequently Asked Questions

Is the Regex Tester & Debugger free to use?

Yes, DODDY's Regex Tester & Debugger is 100% free with no account registration, subscriptions, watermarks, or usage limits.

Does this regex tool support lookaheads and lookbehinds?

Yes! It relies on standard browser V8 JavaScript regex engine.

Are my files and data kept private when using Regex Tester & Debugger?

Yes. All computations and file transformations run locally within your web browser. Your confidential data is never transferred to external servers.