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From: paul@aqua.ccit.arizona.edu (Paul Sanchez)
Newsgroups: comp.editors
Subject: Re: VI question
Message-ID: <PAUL.91Apr17111707@aqua.ccit.arizona.edu>
Date: 17 Apr 91 18:17:07 GMT
References: <1991Apr16.234809.23553@massey.ac.nz>
Distribution: world,local
Organization: Systems & Industrial Engineering, U of AZ
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Nntp-Posting-Host: aqua.ccit.arizona.edu
In-reply-to: news@massey.ac.nz's message of 16 Apr 91 23:48:09 GMTLines: 9

how about

:%s/\([A-Z][A-Z][A-Z][A-Z]\) \([A-Z][A-Z][A-Z][A-Z]\)/\1,\2/g

by the way, you didn't specify what the separator was to be.  this
solution assumes blank, but if you want something else (or a set of
things), put an appropriate subtitution for the blank above.
e.g. -	"." will match anything.
	[ ,:;] will match any of space, comma, colon, semicolon.