| CharacterIterator | Encapsulates different types of character sources - String, InputStream, ... | code | html |
| CharacterArrayCharacterIterator | Encapsulates char[] as CharacterIterator | code | html |
| RE | RE is an efficient, lightweight regular expression evaluator/matcher class. | code | html |
| RECompiler | A regular expression compiler class. | code | html |
| RECompiler.RERange | Local, nested class for maintaining character ranges for character classes. | code | html |
| REDebugCompiler | A subclass of RECompiler which can dump a regular expression program for debugging purposes. | code | html |
| REDemo | Interactive demonstration and testing harness for regular expressions classes. | code | html |
| REProgram | A class that holds compiled regular expressions. | code | html |
| RESyntaxException | Exception thrown to indicate a syntax error in a regular expression. | code | html |
| RETest | Data driven (and optionally interactive) testing harness to exercise regular expression compiler and matching engine. | code | html |
| RETestCase | code | html | |
| REUtil | This is a class that contains utility helper methods for this package. | code | html |
| ReaderCharacterIterator | Encapsulates java.io.Reader as CharacterIterator | code | html |
| RegexpTunnel | This class exists as a gateway to access useful Jakarta Regexp package protected data. | code | html |
| StreamCharacterIterator | Encapsulates java.io.InputStream as CharacterIterator. | code | html |
| StringCharacterIterator | Encapsulates String as CharacterIterator. | code | html |
| recompile | 'recompile' is a command line tool that pre-compiles one or more regular expressions for use with the regular expression matcher class 'RE'. | code | html |