How to reverse/swap the order of “Sales price” and “Regular prcie” in woocommerce?

You’re going to want to use hooks and filters to change that. I would look at the woocommerce_get_price_html and/or woocommerce_variable_price_html filters.

EDIT:

here is the core WC code you need to alter:

/**
 * Format a sale price for display.
 *
 * @since  3.0.0
 * @param  string $regular_price Regular price.
 * @param  string $sale_price    Sale price.
 * @return string
 */
function wc_format_sale_price( $regular_price, $sale_price ) {
    $price="<del>" . ( is_numeric( $regular_price ) ? wc_price( $regular_price ) : $regular_price ) . '</del> <ins>' . ( is_numeric( $sale_price ) ? wc_price( $sale_price ) : $sale_price ) . '</ins>';
    return apply_filters( 'woocommerce_format_sale_price', $price, $regular_price, $sale_price );
}

as you can see, there’s a filter on the returned value. what you want ot do is hook into that filter and return the prices how you want. something like this:

add_filter('woocommerce_format_sale_price', 'wc_override_sale_price_format', 10, 2);
function wc_override_sale_price_format( $regular_price, $sale_price ) {
    $price="<ins>" . ( is_numeric( $sale_price ) ? wc_price( $sale_price ) : $sale_price ) . '</ins> <del>' . ( is_numeric( $regular_price ) ? wc_price( $regular_price ) : $regular_price ) . '</del>';
    return $price;
}

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