preg replace block images from a website

preg_replace

[MrGecko]

Hello how would I block images from a website such as example.com
the image tag will be in many different formats such as <img title="test" src="www.example.com/img.png" onlick="do some thing">.

Thanks,
Mr, Gecko

[MrGecko]

If you can't tell me can you tell me where I can learn how?

[eelixduppy]

Once you grab the html img string from the rest of the html then I would just do a simple strpos [php.net]() check on it and if it doesn't return false, block it.