How to Test Regular Expressions (Regex)
Regular expressions are powerful but tricky. Our tester shows matches in real-time with a visual breakdown.
Key Features: Real-time matching • Match highlighting • Regex cheat sheet • Copy pattern
Common Regex Patterns
- Email:
^[\w.-]+@[\w.-]+\.\w+$ - Phone:
^\+?[\d\s-]+$ - URL:
^https?://[^\s]+$
Step-by-Step Guide
Step 1: Open the Regex Tester
Go to Developer Tools and select "RegEx".
Step 2: Enter Pattern and Test Text
Enter your regex pattern and the text to test against.
Step 3: View Matches
See highlighted matches and match details in real-time.
Tip: Use the cheat sheet button to reference common regex patterns.
FAQ
What are regex flags?
Flags modify matching: g (global), i (case-insensitive), m (multiline), s (dotall).