How to remove pingback from head?

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Here’s my improvement on it with less code for the same results:

add_action( 'plugins_loaded', 'wpse_158700_buffer' );

function wpse_158700_buffer() {
    # Enable output buffering
    ob_start( 'wpse_158700_pingback_url' );
}

function wpse_158700_pingback_url( $buffer ) {
    # If in the admin panel, don't run
    if ( is_admin() && ( ! defined( 'DOING_AJAX' ) || ! DOING_AJAX ) ) {
        return $buffer;
    }
    $buffer = preg_replace( '/(<link.*?rel=("|\')pingback("|\').*?href=("|\')(.*?)("|\')(.*?)?\/?>|<link.*?href=("|\')(.*?)("|\').*?rel=("|\')pingback("|\')(.*?)?\/?>)/i', '', $buffer );
    return $buffer;
}

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