you can use regex to find your the src and use that to append your “files/myimagescript?” to it:
function append_myimagescript($attr, $content){
$pattern = '/src="https://wordpress.stackexchange.com/questions/11618/([^"]*)"/i';
$replacement="files/myimagescript?${1}";
return preg_replace($pattern, $replacement, $content);
}
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