Regex Tester
Advanced playground for Regular Expressions. Test patterns in real-time with group highlighting, lookahead/lookbehind support, and a comprehensive cheat sheet.
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aboutTool
Regex Tester is a sandbox for building and testing Regular Expressions. Visually inspect how your patterns match against input text and analyze capture group results in real-time.
howToUse
- Enter your Regular Expression pattern at the top
- Set your desired flags (global, case-insensitive, etc.)
- Paste the test string you want to match against
- Review highlighted matches and capture group details
features
- Real-time matching and visual feedback
- Detailed capture group breakdown
- Engine compatibility guides (JS, Python, PHP, etc.)
- Built-in regex cheat sheet
- Replace functionality simulation
- Pattern saving and sharing capabilities
faq
I'm new to regex, any help?
We provide an integrated cheat sheet and examples for common tasks like email or URL validation.
Does it support Unicode?
Yes, you can match Korean, Japanese, and other Unicode characters using standard patterns.
Which regex engine is used?
It primarily follows the JavaScript (V8) RegExp implementation standard.