This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Can I ask what String s you are trying to concatenate and what purpose you are using it in the comparison for? I don't _think_ ANT directly supports what you are after but there might be another way around your problem.