The Jakarta-ORO Java classes are a set of text-processing Java classes that provide Perl5 compatible regular expressions, AWK-like regular expressions, glob expressions, and utility classes for performing substitutions, splits, filtering filenames, etc. This library is the successor to the OROMatcher, AwkTools, PerlTools, and TextTools libraries from ORO, Inc. (www.oroinc.com). They have been donated to the Jakarta Project by Daniel Savarese (www.savarese.org), the copyright holder of the ORO libraries. Daniel will continue to participate in their development under the Jakarta Project.
The Jakarta Project is lucky to also be able to offer another more "lightweight" regexp solution for you as well as this package. Options are a good thing and we will leave which one you choose to use up to you. :-) They are both perfectly good packages, we just consider the Jakarta ORO package to be more a more complete regular expression package.
You can download the latest released version from the distribution directory.
The Javadoc is available online. It is also included in the distribution download.
An online FAQ is available for commonly asked questions like, "What is a regular expression?", "Why did you do this? There are already other Java regexp packages available!", etc.
If you would like to get involved with this project in one way or another (Mailing lists, CVS, Contributions), please see the Getting Involved section of the Jakarta Website.