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From:	"rob pike" <rob@plan9.bell-labs.com>
Subject: Re: the obvious. =) 
Date:	Mon, 27 Mar 2000 09:37:26 -0500
To:	sam-fans@hawkwind.utcs.toronto.edu
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	,x/^\/\*(.+\n)+ \*\/\n/ t /}\n/

Regular expressions have their limitations, which is why Sam
also has addresses. These provide a simpler and safer way to
match multi-line things like comments:

	,x/^\/\*/ .,/\*\/\n/ t /}\n/

This one works even if there are no blank lines.
Here's a troff paragraph-at-a-time pattern:

	,x/^\.PP/ .,/^\.(PP|SH)/-     ...

Also if there's a slash in the pattern, you can use another character
as the delimiter and save a backslash, as in this example for C++ //
comments:

	x/\/\//  goes to x;//;

Have fun.

-rob