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REx (Regular Expressions for XML) is a syntax extension to the Simple API for XML (SAX) standard in Java. REx lets you use regular expressions to filter SAX events, allowing you to focus more directly on elements of interest when handling large or complex XML documents. The language provides an additional tool for parsing and processing XML data without having to load entire documents into memory, which can be useful when dealing with limited system resources or very large datasets. This makes REx a powerful technology for efficient and targeted manipulation of structured data within the broader context of Java-based applications.

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