🔍 Regex Tester
Test and debug regular expressions with real-time matching
🔒 Your image never leaves your device. All processing happens locally in your browser using JavaScript RegExp engine. No upload, no server, no tracking.
Features
- Real-Time Matching — See matches highlighted instantly as you type your pattern and test string.
- Capture Groups — View captured groups for each match — essential for complex patterns.
- Find & Replace — Test regex replacements with a replace string and see the result.
- Common Patterns — Quick-load common patterns for email, URL, phone, IP, and date validation.
How It Works
- Enter a regex pattern — Type your regular expression and set flags (g, i, m, s).
- Enter test text — Paste the text you want to match against.
- Review matches — See highlighted matches, capture groups, and optionally test replacements.
Use Cases
- Debug and test regex patterns before using them in code
- Validate email, URL, or phone number patterns
- Search and replace text with complex pattern matching
Frequently Asked Questions
What regex flavor is used?
JavaScript's built-in RegExp engine, which supports standard features including lookahead, lookbehind, named groups, and Unicode escapes.
Are the common patterns reliable?
They cover the most common use cases. For production validation, always test with edge cases specific to your requirements.
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