@Override
	public boolean isSubFilterOf(TextFilter parentFilter) {

		if (!(parentFilter instanceof ContainsTextFilter)) {
			return false;
		}

		ContainsTextFilter parent = (ContainsTextFilter) parentFilter;
		if (caseSensitive != parent.caseSensitive || allowGlobbing != parent.allowGlobbing) {
			return false;
		}

		if (parentIsGlobEscape(parent)) {
			return false;
		}

		boolean isSubFilter = filterText.contains(parent.filterText);
		return isSubFilter;
	}
A filter that will pass text when it contains the filter text.
Ghidra/Framework/Docking/src/main/java/docking/widgets/filter/ContainsTextFilter.java