Regex Tester
Test regular expressions against sample text with real-time match highlighting and capture group extraction.
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Frequently Asked Questions
What regex flavor does this use?
JavaScript (ECMAScript). Most patterns work the same in Python, Java, and PHP, but lookbehind support varies by engine.
Can I test replacement patterns?
This tool focuses on matching. For search-and-replace, use your code editor or a dedicated tool like sed/awk.