Supports static analysis of Java programs. It parses Java source code files and class files and builds a complete abstract syntax tree from Java source code files, enriched with name and type analysis information. [Open Source, GPL]

Significantly faster than String.indexOf for large strings. [Open Source]

Provides enhanced date and time support for the Java 2 platform. [Commercial]

Pure Java implementation of a traditional (non-POSIX) NFA regular expression engine. Its syntax can emulate many popular development tools, including awk, sed, emacs, perl and grep. [Open Source, LGPL]

Freely available Unicode-based technologies in Java. Includes number format classes, calendar classes, string search and string processing classes. [Open Source, X license]

A set of text-processing classes that provide Perl5 compatible regular expressions, AWK-like regular expressions, glob expressions, and utility classes for performing substitutions, splits, and filtering filenames. This library is the open source successor to the OROMatcher, AwkTools, PerlTools, and TextTools libraries from ORO, Inc. [Open Source, BSD-like]

Lightweight regular expressions pattern matcher. [Open Source, BSD-like]

the original and true Java C-style printf with variable number of parameters for formatting strings in Java. [Free for non-commercial]

Webtrans: a document translation architecture in Java. Wiki: an application of Webtrans which is an editable website. [Open Source, LGPL]

Regular expression support that offers a superset of Perl5.6 regex syntax, compatibility with JDK 1.1). Includes documentation, examples, and demonstration applet. [Open Source, BSD-like]

A Java API for providing text-checking functionality (spell checkers, grammar checkers, style checkers) to Java programs. [Open source, LGPL].

Java implementation of printf, sprintf, and fprintf with extended object-oriented features. Source available.

A small footprint parser for extracting class/interface/method definitions from source files complete with JavaDoc @tags. It is designed to be used by active code generators or documentation tools. [Open source, Apache Software License]

Java spell checker component from Keyoti Software.

A Java library that provides several high-performance pattern matching (string searching) algorithms.

A feature-rich text processing library for Java. [Commercial]

A syntax highlighting package designed for use in text editors. The default implementation will produce colored HTML files from source files. It currently supports Java, C/C++, and HTML. [Open Source, GPL]