? seen_re.patch
Index: bot_seen/bot_seen.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/bot/bot_seen/Attic/bot_seen.module,v
retrieving revision 1.1.2.12.2.7
diff -u -p -r1.1.2.12.2.7 bot_seen.module
--- bot_seen/bot_seen.module	6 Feb 2009 17:44:31 -0000	1.1.2.12.2.7
+++ bot_seen/bot_seen.module	12 May 2010 21:35:31 -0000
@@ -111,7 +111,12 @@ function bot_seen_all_nicks_for_regexp()
   foreach ($irc->channel as $channel_name => $data) {
     foreach ($irc->channel[$channel_name]->users as $nick_name => $data) {
       $nick_name = preg_quote($nick_name, '/');
-      $nick_name = preg_replace('/^(.)(.*)/', '(\1)(\2)', $nick_name);
+
+      // The \\\\ is a single literal backslash doubly escaped against PCRE
+      // and PHP.  So for readability, think of it as ([^\]|\.) -- any
+      // character other than a backslash, or a backslash followed by a single
+      // character.
+      $nick_name = preg_replace('/^([^\\\\]|\\\\.)(.*)/', '(\1)(\2)', $nick_name);
       $nicks[] = '/\b' . $nick_name . '\b/i';
     }
   }