正则表达式替换所有字符串，排除特殊前缀

Question

I want to replace a tag but only, if there is not a special prefix. I need to replace the href but not the data-orig

$string = "Some gibberish here <a href='###REPLACEME:needed###' data-orig-href='###REPLACEME:needed###'>url</a>" ;
$pattern = "/###REPLACEME:(.*)###/";
$replace = "http://somerealurl.dev";
$string = preg_replace($pattern, $replace, $string);

I have no idea how I can realize this pattern.

Answer 1

解决了

$pattern = '/(?<!data-orig-href=")###REPLACE:(.*?)###/';