Anti spam bot for WordPress

functions.php

// Antispambot
// From http://www.guylabbe.ca/blog/wp-antispambot.html
function asb($content){
    return preg_replace('/([_a-zA-Z0-9.\-]*@[a-zA-Z0-9]([_a-zA-Z0-9\-]+\.)+[a-zA-Z]{2,10})/e',"antispambot('\\1')",$content);
}
add_filter('the_content','asb');