The issue has now been fixed in the expect CVS repository, using
one of my patches, slightly edited.  This commit of retoglob.c
fixes it:

revision 5.6
date: 2010/08/27 22:24:33;  author: hobbs;  state: Exp;  lines: +38 -0
       * retoglob.c: Fail if the generated glob contains more than
       two asterisks.  Fixes [Expect SF Bug 3010684] (cederqvist)

For your backporting convenience, I attach the patch here.
The upstream ChangeLog entry is:

2010-08-27  Jeff Hobbs  <je...@activestate.com>

       * retoglob.c: Fail if the generated glob contains more than
       two asterisks.  Fixes [Expect SF Bug 3010684] (cederqvist)

** Patch added: "The solution that is applied upstream"
   
https://bugs.launchpad.net/ubuntu/+source/expect/+bug/612523/+attachment/1537869/+files/two-asterisks.patch

-- 
Severe performance regression due to glob gate
https://bugs.launchpad.net/bugs/612523
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