What: commas added to numbers
 Where: From the contact
 Description: Tiny Tcl regsub comma to add commas to numbers, taking
        leading white space, - or +, and decimal points into account.
 Updated:
 Contact: mailto:allen@gdstech.grumman.com (John Allen)

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In [Bag of algorithms] there's a one-liner alternative 
by [Peter Spjuth] (in the Tcl chatroom, 2004-10-05) 
using modern regexp features:

 proc commify number {regsub -all {\d(?=(\d{3})+($|\.))} $number {\0,}}


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