// at construction, we build up a new list and add all those
// objects whose toString() method matches the regular expression
public RegexIterable(Iterable<T> it, String regex) {
Collection<T> filteredItems = new ArrayList<T>();
for (T t : it) {
if (String.valueOf(t).matches(regex)) {
filteredItems.add(t);
}
}
this.filteredItems = Collections.unmodifiableCollection(filteredItems);
}
