y/a-z/A-Z/ (was Re: sed: how to capitalize replacement text?)

[Randal L. Schwartz @ Stonehenge]

In article <426b0af2.142c4 at retina.engin.umich.edu>, brian at caen (Brian Holtz) writes:
| 
| Is there a way to uppercase the pattern text in the replacement text
| with sed's substitute command?  In ex/vi, you just say
| 	s/regexp/\U&/
| but not, apparently, in sed/ed.

You can capitalize *all* of the sed pattern space with

	y/a-z/A-Z/

which is not in the sed paper (if I remember right) but is tucked away
on the sed manpage.  To capitalize just a regexp takes a bit of work
with sed.  Use perl instead :-), as in:

	s/(regexp)/($y = $1) =~ y|a-z|A-Z|, $y/eg;

(Thanks, Larry Wall...)
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