JavaRegex - Regex package. Includes download, tutorial, tester, e-book of regex recipes. JRegex - Java library with support for Perl 5.6 regex syntax. Includes documentation, examples and demo. Javaworld - Article about regex matching. Discusses syntax, libraries and classes. The Java Tutorials - Lesson explaining how to use the java.util.regex API. Describes methods and syntax. Jrexx - Regex API with extended syntax that allows union, intersection and difference matching. Includes download link. Regexp Editor - Online tool to test Java regular expressions. Matches, splits and replaces. Dk.brics.automaton - Regex package that supports UTF-16 and non-standard operations such as unions and intersections. Includes documentation, FAQ and download. Jakarta Regexp - Retired Java regex package. Includes archived release. Jakarta ORO - Retired project with Java classes that supported Perl5-compatible and AWK-like regular expressions. Features archived releases.