The ant documentation contains an example:

http://ant.apache.org/manual/CoreTypes/mapper.html

See also the copy task docs: http://ant.apache.org/manual/CoreTasks/copy.html

Note that the jar that provides the regexp functionality must be loaded by the
same classloader as the rest of the ant system. (Usually this is the case, if
you have the jar in ant's lib.)

Ville Oikarinen