Regular expressions are one of the most useful programming tools, particularly for text processing. Java has a nice implementation, stored in the java.util.regex package.
The following page by David Matuszek contains a Java Applet to test regular expressions. I use it a lot and recommend it!
http://www.cis.upenn.edu/~matuszek/General/RegexTester/regex-tester.html
Have fun!
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