i want remove class from post links

I found this very irritating. So, I came up with my own solution. This filters the content before it gets sent to the browser while leaving the stored version in the DB unchanged. I believe Rank Math needs the class for Gutenberg special link options. Win-win for both you and Rank Math.

if ( !function_exists('filter_the_content_remove_rank_math_link') ) {
    /**
     * Remove/filter `rank-math-link` class added by Rank Math
     *
     * @param $content
     * @return string|string[]
     */
    function filter_the_content_remove_rank_math_link( $content )
    {
        // Check if we're inside the single Post.
        if ( is_singular() ) {
            $content = str_replace(['rank-math-link', 'class=""'], '', $content);
        }

        return $content;
    }

    add_filter('the_content', 'filter_the_content_remove_rank_math_link', 1);
}

Yes, you can also change the str_replace or used a regex