Index: wp-includes/query.php
===================================================================
--- wp-includes/query.php	(revision 13034)
+++ wp-includes/query.php	(working copy)
@@ -1765,6 +1765,7 @@
 					$search .= " AND ($wpdb->posts.post_password = '') ";
 			}
 		}
+		$search = apply_filters('posts_search', $search, $this);
 
 		// Category stuff