Question

How can I tranform this regex to search only in src=* and not all the links that start with http and end with jpg, png, gif? Additionally I want to get the https images.
Thank you!

preg_match('!http://.+\.(?:jpe?g|png|gif)!Ui' , $content , $matches);

Answer 1

Prefix your regex with a negative assertion to filter out the common occurences:

 (?<!src=["\']|src=)

“Prefixing” means after your ! and before the https?://..

preg_match('!(?<!src=["\']|src=)http://.+\.(?:jpe?g|png|gif)!Ui' , $content , $matches);