[Bug regex/500] regex code can be optimized a lot

[drepper at redhat dot com]

-- 
Bug 500 depends on bug 501, which changed state.

Bug 501 Summary: transit_state is slow
http://sources.redhat.com/bugzilla/show_bug.cgi?id=501

           What    |Old Value                   |New Value
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

http://sources.redhat.com/bugzilla/show_bug.cgi?id=500

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