@Nullable
    @Override
    public RegExpNumber getMin() {
        final ASTNode[] nodes = getNode().getChildren(TOKENS);
        if (nodes.length == 0 || nodes[0].getElementType() != RegExpElementTypes.NUMBER) {
            return null;
        }
        return (RegExpNumber)nodes[0].getPsi();
    }
@Nullable
    @Override
    public RegExpNumber getMin()