Regex Tester
Online Regex Tester & Debugger
Write, test, and debug regular expressions in real-time. The easiest way to learn and verify your regex patterns.
Powerful Features
Real-time Matching
See matches highlight instantly as you type your pattern
Flag Support
Full support for global (g), case-insensitive (i), multiline (m) and more
Capture Groups
Inspect captured groups and indices for every match
JS Engine
Uses native JavaScript regex engine for 100% accuracy
Highlighting
Clear visual highlighting makes debugging easy
Privacy First
All processing happens locally in your browser
How It Works
Enter Pattern
Type your regular expression in the top input field (e.g., [a-z]+)
Set Flags
Add flags like 'g' for global search or 'i' for case insensitivity
Paste Test Text
Enter the text you want to test against in the large text area
View Results
See matches highlighted instantly and check the match count
Perfect For
Essential tool for developers and data scientists
🔍 Form Validation
Test patterns for email, phone, and password validation
🧹 Data Cleaning
Develop patterns to extract or replace data
📚 Learning Regex
Experiment with patterns to understand how they work
⚙️ Server Config
Test rewrite rules for Nginx or Apache
🔎 Search & Replace
Test complex find and replace patterns
🐛 Debugging
Troubleshoot why a regex isn't matching as expected
Common problems this tool solves
Extract Data from Text Logs
Turn messy logs into structured data. Use capture groups to isolate and extract specific values from server logs or large text blocks.
Test URL Redirect Patterns
Double-check your Nginx or Apache rewrite rules. Verify that your regex correctly matches paths before deploying to production.
Validate Email and Phone Patterns
Never ship a broken validation again. Test your email, phone, and password regular expressions against multiple test cases instantly.