I get the product pictures from a supplier in a csv file with addresses like below:
most of the url are fine and easy to replace with a simple replace:

• supplier.com/images/ref_1.png

becomes

• mywebsite.com/media/tires/ref_1.png

with

$URL_photo = str_replace( "supplier.com/images/", "mywebsite.com/media/tires/", $URL_photo

but I have also some urls from my supplier which include subfolders paths

• mysupplier.com/images/c/brand1/ref_1.jpg
• mysupplier.com/images/c/brand2/ref_27.jpg
• mysupplier.com/images/09/ref_300.png
• mysupplier.com/images/cd/ref_10.png

How to regex or replace to get the same simpler url ?
mywebsite.com/media/tires/ref_1.png

My script is in PHP.