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Date: Wed, 5 Feb 2003 01:03:44 +0000
From: Hugo Mills <hugo-lkml@carfax.org.uk>
To: linux-kernel@vger.kernel.org
Subject: Re: gcc 2.95 vs 3.21 performance
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On Wed, Feb 05, 2003 at 12:51:12AM +0100, Jakob Oestergaard wrote:
> On Tue, Feb 04, 2003 at 03:21:01PM -0800, Larry McVoy wrote:
> > I can't offer any immediate help with this but I want the same thing.  At
> > some point, we're planning on funding some extensions into GCC or whatever
> > reasonable C compiler is around:
> > 
> >     - regular expressions
> > 
> >       {
> >       	  char	*foo = "blech";
> > 
> > 	  if (foo =~ /regex are nice/) {
> > 	  	printf("Well isn't that special?\n");
> > 	  }
> >       }
> 
> Ok, I can't help you with that.

   I wanted something like that a while ago, so I wrote a couple of
classes in C++ to handle regexps. Some of the test code looks like
this:

        string str = "fum foo";
	rejex exp("f(o*)");
	// Search for a regex
	if( s/exp )
		cout << "Found it!" << endl;
	// Count matches
	cout << s/exp << " matches" << endl;

	replace rep("g$0");

	// Search & replace
	str/exp/rep;
	cout << s << endl;

	// All in one
	"foo bar"/rejex("ba")/replace();

   It's not perfect by any stretch of the imagination, but it works.
I've not released it, because I haven't had a chance to get it into a
releasable form yet. Actually, looking at it, I should probably play a
couple of tricks with overloading operators to give you instead

   str =~ search/replace;

or even

   "str" =~ "search"/"replace";

> You have probably seen a Perl program before... Now imagine a two
> million line Perl program... That is why the above is not a good idea ;)
> 
> It's still your right to want it of course...

   That's a good point, but I've always felt that the main problem
with perl isn't the regexes, but the rest of the language(*).

   Hugo.

(*) Some may feel that, coming from a C++ programmer, this is a case
of the pot calling the kettle black. :)

-- 
=== Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk ===
  PGP key: 1C335860 from wwwkeys.eu.pgp.net or http://www.carfax.org.uk
   --- Our so-called leaders speak/with words they try to jail ya/ ---   
        They subjugate the meek/but it's the rhetoric of failure.        
                                                                         

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