quotes that don't require escape of special characters

Hallo

very useful would be to have quotes that don't require you to escape $ \ and other characters. Of course one needs to ensure the data doesn't contain quotes from the same type.

For example one can say:
def str = ''''<echo message="${hallo}"/>''''
println str;

And output be:
<echo message="${hallo}"/>

instead of no such property "hallo" for...

Another more useful example of such quotes usage is writing regular expressions. I have really hard time figuring out how to escape characters there!