How to remove author base in WordPress

I've tested this combined solution but wasn't working before regenerating of permalinks. You can do it, as brasfolio described : simply clicking save on permalink page in dashboard.

add_filter('author_rewrite_rules', 'no_author_base_rewrite_rules');function no_author_base_rewrite_rules($author_rewrite) {   global $wpdb;   $author_rewrite = array();   $authors = $wpdb->get_results("SELECT user_nicename AS nicename from $wpdb->users");      foreach($authors as $author) {       $author_rewrite["({$author->nicename})/page/?([0-9]+)/?$"] = 'index.php?author_name=$matches[1]&paged=$matches[2]';       $author_rewrite["({$author->nicename})/?$"] = 'index.php?author_name=$matches[1]';   }     return $author_rewrite;}if( !is_admin() ) {add_action('init', 'author_rewrite_so_22115103');}function author_rewrite_so_22115103() {   global $wp_rewrite;    if( 'author' == $wp_rewrite->author_base ) $wp_rewrite->author_base = null;}

Your code appears fine. Manually flush your permalink structure to reflect these changes.

1)  Settings -> Permalinks -> choose default -> Save2)  Revert the settings to original.

Try: RedirectMatch 301 ^/author/(.+)$ http://www.yourblog.com/$1

This will go in your .htaccess