Rep is a regex search replace utility.  You control it by writing a script
in Java and compiling it.  It thus requires some basic knowledge of Java.
You specify a list of files and directories for it to process, and a list
of extensions.
You also provide a list of search/replace pairs, either simple strings, or
Java Regex Search patterns.
The advantages over other similar utilities:
1. It is faster that a script-driven utility such as Funduc, since everything is precompiled.
2. uses Java Regex syntax
3. Scripts can be distributed in tamper-proof form.
4. Warns you if some of the search strings had no matches.
You must write and compile a class that extends Script to define the
search/replace strings and the files and directories you want to process.
If you don't put it in the main jar or insert a jar classpath to find it,
you will not be able to use jars.  You will have to run the raw class
files.