--- hiki/session.rb.orig	2007-06-23 22:09:37.468750000 +0900
+++ hiki/session.rb	2007-06-23 22:08:53.578125000 +0900
@@ -12,7 +12,7 @@
       @conf = conf
       @max_age = max_age
       if session_id
-        if /[0-9a-f]{16}/ =~ session_id
+        if /\A[0-9a-f]{16}\z/ =~ session_id
           @session_id = session_id
         else
           @session_id = nil