|  Friedl, Jeffrey. Mastering Regular Expressions . Cambridge, MA: O'Reilly & Associates, 2002 (ISBN 0596002890). Hard to find a better book on regular expressions.  http://java.sun.com/j2se/1.4/docs/relnotes/features.html ”A guide to the new features of version 1.4 of the Java 2 SDK. http://java.sun.com/j2se/1.4/docs/guide/collections/changes4.html ”A summary of the enhancements made to the collections framework in version J2SE 1.4. http://www.google.com/url?sa=U&start=6&q=http://developer.java.sun.com/developer/technicalArticles/releases/1.4regex/&e=912 ”A gentle introduction to regular expressions in Java. http://www.google.com/url?sa=U&start=12&q=http://java.sun.com/docs/books/tutorial/extra/regex/&e=912 ”A tutorial on regular expressions in J2SE 1.4. http://java.sun.com/j2se/1.4/docs/guide/lang/assert.html ”A full explanation for using assertions with examples. http://developer.java.sun.com/developer/JDCTechTips/2002/tt0409.html ”A helpful Tech Tip about using assertions.  | 