pattern

Oro

Linear time regular expressions for Java

Jakarta RegExp

RegExp

Generex A Java Library for regex to Strings generation

Java port of Oniguruma: http://www.geocities.jp/kosako3/oniguruma that uses byte arrays directly instead of java Strings and chars

Named capturing groups for Java 5/6

A regular expression library for Java

PatternTesting Runtime (patterntesting-rt) is the runtime component for the PatternTesting framework. It provides the annotations and base classes for the PatternTesting testing framework (e.g. patterntesting-check, patterntesting-concurrent or patterntesting-exception) but can be also used standalone for classpath monitoring or profiling. It uses AOP and AspectJ to perform this feat.

GNU RegExp