How to load different css file depending on language

Question

function load_my_styles() {
    wp_register_style( 'my-en-style1', plugins_url( 'en-style1.css', __FILE__ ) );
    wp_register_style( 'my-en-style2', plugins_url( 'en-style2.css', __FILE__ ) );

    wp_register_style( 'my-ja-style1', plugins_url( 'ja-style1.css', __FILE__ ) );
    wp_register_style( 'my-ja-style2', plugins_url( 'ja-style2.css', __FILE__ ) );

    $lang = preg_match( '/^\/ja\//i', $_SERVER['REQUEST_URI'] ) ? 'ja' : 'en';
    wp_enqueue_style( "my-{$lang}-style1" );
    wp_enqueue_style( "my-{$lang}-style2" );
}
add_action( 'wp_enqueue_scripts', 'load_my_styles' );