Regular expression code implementation review between Tcl vs Python

[lvirden at yahoo.com]

According to K_Lee <Google_Post at slink-software.com>:
:Tcl's Stub interface to the external commands is confusing to 
:outsider.   I still don't get why the stub interface is needed.

Check out the explanation at http://wiki.tcl.tk/stubs to understand
why the stub interface is needed.
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