My site is receiving loads of spammy backlinks by hotlinking to my images. I literally receive thousands of backlinks from these spammy domains.
One example is .blogspot.com. I have thousands of subdomains hotlinking to my images from .blogspot.com.
What I want to do is create a rule to stop all hotlinks from the subdomains of .blogspot.com and any other culprit website, but I want to allow hotlinks from the main domain.
For example, in the case of .blogspot.com, I want to allow hotlinking from blogspot.com but block hotlinking from a subdomain like tdssee64dee.blogspot.com.
I need help with developing the Regex for this. Thanks, guys for your help in advance.