List or delete all transients with a specific prefix WordPress

list_transients_by_prefix.php

function delete_transients_with_prefix( $prefix ) {
    foreach ( get_transient_keys_with_prefix( $prefix ) as $key ) {
       // delete_transient( $key );
        echo "<br>". $key." ".get_transient( $key );
    }
}

/**
 * Gets all transient keys in the database with a specific prefix.
 *
 * Note that this doesn't work for sites that use a persistent object
 * cache, since in that case, transients are stored in memory.
 *
 * @param  string $prefix Prefix to search for.
 * @return array          Transient keys with prefix, or empty array on error.
 */
function get_transient_keys_with_prefix( $prefix ) {
    global $wpdb;

    $prefix = $wpdb->esc_like( '_transient_' . $prefix );
    $sql    = "SELECT `option_name` FROM $wpdb->options WHERE `option_name` LIKE '%s'";
    $keys   = $wpdb->get_results( $wpdb->prepare( $sql, $prefix . '%' ), ARRAY_A );

    if ( is_wp_error( $keys ) ) {
        return [];
    }

    return array_map( function( $key ) {
        // Remove '_transient_' from the option name.
        return substr( $key['option_name'], strlen( '_transient_' ) );
    }, $keys );
}


//To fire the function:
delete_transients_with_prefix( 'speedguard');