@Override
			public void actionPerformed(ActionEvent e) {
				ContextRegisterFilterInputDialog filterDialog =
					new ContextRegisterFilterInputDialog("Set Context Register Filter", extent,
						mainPanel);
				registerFilter = filterDialog.getFilter();
				if (registerFilter == null) {
					return;
				}
				applyFilterAction();
			}
Returns the context register filter
@return context register filter
Ghidra/Features/BytePatterns/src/main/java/ghidra/bitpatterns/gui/ContextRegisterFilterablePanelBuilder.java