You just need a join to make your current expression's output (list) into a string. But @sivel's solution with slicing is probably better, the reason you cannot find it in documentation is because this is a "Pythonism" and a property of Python list objects. Ansible uses Jinja for expression evaluation, Jinja compiles into Python in the end and exposes many of the properties of those Python objects, neither Ansible nor Jinja document these properties so you would need to a) know the type of object you are dealing with and b) look at python documentation for those objects.
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