RegExr
FreeRegExr is a powerful, HTML/JS-based online tool designed for creating, testing, and learning about Regular Expressions. It provides a user-friendly interface with real-time feedback, allowing developers and learners to quickly construct and validate complex regex patterns.
Key Features
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Excellent real-time visual feedback for learning and debugging.
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Comprehensive set of features for testing and building regex.
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Free and accessible directly in the browser.