Path: utzoo!attcan!uunet!mcvax!hp4nl!philmds!leo
From: leo@philmds.UUCP (Leo de Wit)
Newsgroups: comp.lang.c
Subject: Re: not the way ... (was Re: Want a way to strip comments from a)
Message-ID: <982@philmds.UUCP>
Date: 17 Mar 89 19:38:47 GMT
References: <7150@siemens.UUCP> <9900010@bradley> <4221@omepd.UUCP> <981@philmds.UUCP>
Reply-To: leo@philmds.UUCP (Leo de Wit)
Organization: Philips I&E DTS Eindhoven
Lines: 16

In article <981@philmds.UUCP> leo@philmds.UUCP (Leo de Wit) writes:
|Sed is often underestimated; it IS powerful enough:
|
|s/\/\*\([^*/]*\*\)\1*\///g
|
|will eat the comments away just nicely (I'll leave the HOW as an
|exercise for the reader).

Shame on me. That it works is merely a coincidence (put a * in a
comment and see it fail). \1 matches the previous string matching a
\( \) expression, not the expression itself.  And since sed doesn't
like \( \)* type expressions, this would be hard to do in one regexpr.
Can it be proven to be impossible (that is, deleting the comments
with one sed command - multi-line comments not considered) ?

   Leo.