The only place you should no-follow is in to comments? or place it is also important to links external no-follow?

Anyone can confirm if this indeed works on WordPress 3.0? All the nofollow removers I tried so far doesn't do anything :S.

Yes it does work just fine. I use it here on this site. View any of the comments from people that have entered their website url when commenting, or any comments which have a link in the comment body. Neither are nofollow links, and this site is running 3.0.

When I put those codes in my theme's fonction.php, I get the dreaded blank screen of death with some PHP error on it. I guess I'm doing it wrong.

I just realized that the syntax highlighter is breaking the code. here's what it should be showing.
Try this, it's the correct code.

// remove nofollow from comments
  function xwp_dofollow($str) {
	  $str = preg_replace(
	  '~<a ([^>]*)\s*(["|\']{1}\w*)\s*nofollow([^>]*)>~U',
	  '<a ${1}${2}${3}>', $str);
	  return str_replace(array(' rel=""', ""), '', $str);
  }

But, this is what it's showing though, which is incorrect.

 // remove nofollow from comments
  function xwp_dofollow($str) {
	  $str = preg_replace(
	  '~<a ([^>]*)\s*(["|\']{1}\w*)\s*nofollow([^>]*)>~U',
	  '<a ${1}${2}${3}>', $str);
	  return str_replace(array(' rel=""', ""), '', $str);
  }

Thanks for the quick reply, I changed the code as shown and the blank screen is gone. Hoeever, the rel="nofollow" tag is still there after comments(I tried posting some new comments and it is still there.) I'm guessing it might be my theme(Mystique) that's interfering with the filter. Thanks!

It may be your theme. I'm not familiar with that theme so it's possible.

Did you add the action hooks too? You need to add this entire code to the functions.php. If this is all there, and it's not working then it must be something beyond my control, like the theme, or another error somewhere in your theme files, or a plugin possibly.

// remove nofollow from comments
remove_filter( 'pre_comment_content', 'wp_rel_nofollow' );
add_filter( 'get_comment_author_link', 'xwp_dofollow' );
add_filter( 'post_comments_link',      'xwp_dofollow' );
add_filter( 'comment_reply_link',      'xwp_dofollow' );
add_filter( 'comment_text',            'xwp_dofollow' );
function xwp_dofollow($str) {
	$str = preg_replace( '~<a ([^>]*)\s*(["|\']{1}\w*)\s*nofollow([^>]*)>~U',
	'<a ${1}${2}${3}>', $str);
	return str_replace(array(' rel=""', ""), '', $str);
}

realy it is very good logic for nofollow & dofollow

thanks mate!
pushpinder bagga recently posted..A Construction Site Abstract

Thanks for the code.

Icechen,
I use Mystique as well and had the nofollow off until the last upgrade.
The gentleman that built that theme is good about helping.
I will have to get with him or did you figure it out?

Thanks

I figured out how to change the nofollow to follow on the Mystique theme.

You need to edit two locations in the core.php file.

Just do a 'find' in the core.php file and you will find two lines with the nofollow tag.

Change that and all the comments on your site will switch to dofollow.

Cheers

Excellent article, thanks for the code, I shall try to make it work !