How to add no follow to specific links?

The replace code is replacing the whole a element content with <a rel="nofollow">. Here’s the correction:

I used (.+?) between <a and href" and before and after /go/pluto/ to the closing >. Then in the replace, we put $1 $2 $3 etc. to keep them and add rel="nofollow". You can check in this test, and here’s explanation about the replace.

return preg_replace('/<a(.+?)href="https://wordpress.stackexchange.com/questions/354582/(.+?)\/go\/pluto\/(.+?)"(.+?)>/', '<a$1href="$2/go/pluto/$3" rel="nofollow"$4>', $content );

Edit:

Considering there are links that contains rel attribute already, we will run regex that searches for links that does have rel but doesn’t contain nofollow and add nofollow:

return preg_replace('/<a(.+?)href="https://wordpress.stackexchange.com/questions/354582/(.+?)\/go\/pluto\/(.+?)"(.+?)rel="((?!nofollow).)*(?=")/', '$0 nofollow', $content);

I’m still figuring out the appropriate code to insert rel if the a element doesn’t contain it.

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