public boolean matches(String dtFieldName, int dtOffset) {

		if (isIgnored()) {
			return true; // an empty matcher signals to match all fields
		}

		if (fieldName != null) {
			if (Objects.equals(fieldName, dtFieldName)) {
				return true;
			}
		}

		if (fieldOffsets.contains(dtOffset)) {
			return true;
		}

		return false;
	}
Signals that no specific field match is required.
@return true if no field or offset has been specified.
Ghidra/Features/Base/src/main/java/ghidra/app/services/FieldMatcher.java