Woocomerce Add Order Note With Specific Words To Order Completed Notification Email

wconoce.php

//This code snippet will search through the order notes for the words 'Loren ipsum' and then display that note in the Order Completed Email sent to a customer.

function action_woocommerce_email_order_details( $order, $sent_to_admin, $plain_text, $email ) {
    // Target specific email notification
    if ( $email->id == 'customer_completed_order' ) {
        // Get order id
        $order_id = $order->get_id();

        // Get order notes
        $order_notes = wc_get_order_notes( array(
            'order_id'  => $order_id,
            'order_by'  => 'date_created',
            'order'     => 'ASC',
        ));

        // Notes is NOT empty
        if ( ! empty( $order_notes ) ) {
            foreach ( $order_notes as $order_note ) {
                // Check if note contains test 'Loren ipsum' 
                // Modify text Loren ipsum and style as required
                if ( strpos( $order_note->content, 'Loren ipsum' ) !== false ) {
                    echo '<p style="color:blue;font-size:16px;">' . $order_note->content . '</p>';
                }
            }
        }
    }
}

add_action( 'woocommerce_email_order_details', 'action_woocommerce_email_order_details', 1, 4 );

wconoce1.php

//Modified code for u/NathansUsername to extract Tracking number located in order note between square brackets. 

function action_woocommerce_email_order_details( $order, $sent_to_admin, $plain_text, $email ) {
    // Target specific email notification
    if ( $email->id == 'customer_completed_order' ) {
        // Get order id
        $order_id = $order->get_id();

        // Get order notes
        $order_notes = wc_get_order_notes( array(
            'order_id'  => $order_id,
            'order_by'  => 'date_created',
            'order'     => 'ASC',
        ));

        // Notes is NOT empty
        if ( ! empty( $order_notes ) ) {
            foreach ( $order_notes as $order_note ) {
                // Search for tracking number in note content and extract tracking number between square brackets.
                if ( preg_match( '/\[(.*?)\]/', $order_note->content, $matches ) ) {
                    $tracking_number = $matches[1];
                   //Print output in email. Modify style and prefix text here.
                    echo '<p style="color:blue;font-size:20px;">Your tracking number is ' . $tracking_number . '</p>';
                }
            }
        }
    }
}

add_action( 'woocommerce_email_order_details', 'action_woocommerce_email_order_details', 1, 4 );