Bug 306231 The Regular Expression Resource Filter must gracefully handle invalid patterns
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/ResourceFilterGroup.java
Object arguments = null;
	String id = null;
	IPath path = null;
	IProject project = null;
	int type = 0;
	FilterCopy parent = null;
	LinkedList children = null;
	UIResourceFilterDescription original = null;
	int serialNumber = ++lastSerialNumber;
	static private int lastSerialNumber = 0;
	public FilterCopy(UIResourceFilterDescription filter) {
		internalCopy(filter);
		original = filter;
	}
	public void removeAll() {
		initializeChildren();