Only exact matches are returned, but you can use Perls regular expressions. As an alternative, the 'filter' concept is available. It takes a function as the only parameter. This function should expect a list element, and return true or false depending on whether the element matches the criteria. If the object is not a ListBase object but member of a subclass, a new object of that subclass will be returned.
Functions can also be anonymous functions.
Applies the standard sort function to the list attribute. Should be overwritten with an adapted sort function. The second and subsequent occurrences of the same object are deleted. Developed on a Debian B machine.