Debug Patterns with Regex Tester
Master the expressions. The Regex Tester at Online Tool Base is a robust debugging environment for testing Regular Expressions (Regex) against sample text in real-time.
The Power of Regex
Regular Expressions are powerful but notoriously difficult to get right. A single missing backslash can break your validation logic. onlinetoolbase.online provides a sandbox where you can safely experiment with patterns to match emails, dates, phone numbers, and more.
Advanced Debugging Features
We use the native JavaScript Regex engine for 100% web compatibility:
- Live Highlighting: Matches light up instantly as you type.
- Flag Support: Toggle Global (g), Multiline (m), and Case Insensitive (i) flags.
- Capture Groups: See exactly what your query (parentheses) are capturing.
For Developers & QA
Before you commit that validation function to your codebase, verify it here. Test edge cases, check for false positives, and ensure your pattern is bulletproof. It's an essential utility for anyone working with data extraction or form validation.
How to Test
- Enter your Regex pattern (e.g.,
^\d{3}-\d{2}-\d{4}$). - Enter your test string.
- Verify the matches found.
Validate logic with the Regex Tester from Online Tool Base.