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How to Use Regex Tester
1
Enter your regex pattern.
2
Select flags (g, i, m) as needed.
3
Type your test string — matches highlight live in yellow.
Features
✓Live match highlighting as you type
✓Supports g, i, m flags
✓Match count shown
✓Capture group display
✓Clear error messages for invalid patterns
Why Use This Tool
Learn regex interactively
Debug patterns before adding them to code
No browser console or IDE needed
Handles complex patterns accurately
Frequently Asked Questions
What regex flavour does this use?
Client-side JavaScript regex (browser native), which is compatible with JS, Python and most modern languages for basic patterns.
Can I test email validation regex?
Yes! Paste your email regex and test it against various email strings to see which match.