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Using Ant regular expressions on S3 uploads in itself is straight forward:

Check the Use Ant regular expressions to rename files checkbox.
Fill the appearing From Pattern and To Pattern fields.
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Common use cases

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From Pattern: some/local/path/filename\.jar

To Pattern: changedFilename.jar

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Info

In case you need to use end of line matching in your from patterns, note that you need to escape a dollar-sign ($) with another dollar-sign in Ant!

For more complex examples, see the Ant regexp-mapper documentation.