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Answers
In the following I generate examples with value1..value10 as attribute values throughout. Then value1 and value2 have the offending characters inserted. Finally a regex replacement finds those edits and sets them to missing values, and examples with missing values are trashed. If you play around with the ( new in V5 ) regex parameter editor you'll soon see just how useful, but impenetrable, regex can be.
I have some experience with the old RapidMiner versions and am still getting to grips with V5, but its a marvelous tool.