I can confirm that I have the same issue hundreds of times during a scan:
[Dec 23 13:42:19:1387806139.150348:1:error] preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead (8192) File: /***/wp-content/plugins/wordfence/lib/wordfenceURLHoover.php Line: 56
[Dec 23 13:42:19:1387806139.149892:1:error] preg_replace(): The /e modifier is deprecated, use preg_replace_callback instead (8192) File: /***/wp-content/plugins/wordfence/lib/wordfenceURLHoover.php Line: 52