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From: tps@chem.ucsd.edu (Tom Stockfisch)
Newsgroups: comp.lang.c
Subject: Re: regex for C comments
Message-ID: <503@chem.ucsd.EDU>
Date: 12 Jul 89 04:16:25 GMT
References: <19365@paris.ics.uci.edu> <502@chem.ucsd.EDU> <5939@rpi.edu>
Reply-To: tps@chem.ucsd.edu (Tom Stockfisch)
Distribution: na
Organization: Chemistry Dept, UC San Diego
Lines: 29

In article <5939@rpi.edu> flynn@anyguay.acm.rpi.edu (Kevin Lincoln Flynn) writes:
>In article <502@chem.ucsd.EDU> tps@chem.ucsd.edu (Tom Stockfisch) writes:
>>This expression fails on each of the following:
>>	/*****//hello world */
>  Please correct me if I'm wrong, but I don't believe this is a legal C
>comment.  /*****/ should be a complete comment...  /hello world */ is not
>part of it.  

Precisely.  The given pattern,

	"/*""/"*([^*/]|[^*]"/"|"*"[^/])*"*"*"*/"

considers

	/hello world */

to be part of the

	/*****/

comment.  I presume the original idea was to have lex pick legal comments
out of C source code.  Given arbitrary preceding and following text,

	/*****//hello world */

is certainly legal C.
-- 

|| Tom Stockfisch, UCSD Chemistry	tps@chem.ucsd.edu