Rel=sponsored in all pages for external links, functions.php

I need a code for my functions.php theme that all my external lnks matching /go/ to have the atribute rel=”sponored”.

I tried this code, by relacing the word nofollow but is not working. I use enfold theme, and pages, not blog posts, al least now. Is there a code that can replace in widgets, footer, pages, posts, basicly everywhere in the page where is an external link?

Also it should check if already has that atribute.

/*
 *  NOFOLLOW EXTERNAL LINKS
 *************************************************************/
add_filter('the_content', 'my_nofollow');
add_filter('the_excerpt', 'my_nofollow');
function my_nofollow($content) {
    return preg_replace_callback('/<a[^>]+/', 'my_nofollow_callback', $content);
}
function my_nofollow_callback($matches) {
    $link = $matches[0];
    $site_link = get_bloginfo('url');
    if (strpos($link, 'rel') === false) {
        $link = preg_replace("%(href=\S(?!$site_link))%i", 'rel="nofollow" $1', $link);
    } elseif (preg_match("%href=\S(?!$site_link)%i", $link)) {
        $link = preg_replace('/rel=\S(?!nofollow)\S*/i', 'rel="nofollow"', $link);
    }
    return $link;
}

• This topic was modified 4 years, 1 month ago by tobifjellner (Tor-Bjorn “Tobi” Fjellner).
• This topic was modified 4 years, 1 month ago by Steven Stern (sterndata).