February 12, 2011 
Definition:
function wp_rel_nofollow( $text ) {}
Adds rel nofollow string to all HTML A elements in content.
Parameters
- string $text: Content that may contain HTML A elements.
Return values
returns:Converted content.
Source code
function wp_rel_nofollow( $text ) {
// This is a pre save filter, so text is already escaped.
$text = stripslashes($text);
$text = preg_replace_callback('|<a (.+?)>|i', 'wp_rel_nofollow_callback', $text);
$text = esc_sql($text);
return $text;
}
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A HitchHackers guide through WordPress 
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