What: Tcl etags program (Emacs)
 Where: http://www.fsf.org/ 
 Description: Emacs 20.2 or greater includes a program called etags which
        will create editing tag files allowing one to jump directly to
        particular places in the code.
 Updated: 03/1999
 Contact: Unknown

Refer to this page:
 http://www.gnu.org/software/emacs/manual/html_node/emacs/Etags-Regexps.html
So, using the etags command like this:
 etags --language=none --regex="/proc[ \t]+\([^ \t]+\)/\1/" *.tcl
Note that the single quotes are replaced by double quotes, since on Windows platform single quotes aren't supported.

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