Re: bin/39002: harmful AWK extension: non-portable escaped character

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR bin/39002; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: gnats-admin%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost, 
cheusov%tut.by@localhost
Subject: Re: bin/39002: harmful AWK extension: non-portable escaped
        character
Date: Sat, 21 Jun 2008 20:27:15 +0000

 On Fri, Jun 20, 2008 at 09:35:01PM +0000, Greg A. Woods; Planix, Inc. wrote:
  >  Gawk is sometimes a noisy pain in the butt.  :-)
  >  
  >  It is long standing tradition in Unix tools and languages to ignore  
  >  the backslash on non-special characters, right from C on up.
 
 Ordinarily, I'd agree, but in this case I think it's right to warn
 about it.
 
 In awk one often stuffs regexps into string constants, and it's easy
 to forget that if you're trying to escape something *in the regexp*
 you need to write two backslashes. Then one ends up with expressions
 like (foo ~ "\.c$") that superficially look ok but silently do the
 wrong thing. This is doubtless why mawk behaves the way it's reported
 to, but I don't think adopting that behavior is a good idea.
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost