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I found [http://www.mutationevent.com/projects/validate.js/index.php this code] can be useful for my Java assignment. Good thing is we can use the third party code now (properly cited!).
However it's missed a few features. So I've added those and sent the diff (available by request) to [http://www.mutationevent.com/projects/validate.js/suggestions.php the author]:
New features are:
1. regexp validation
2. rule can be optional - validate only if not empty