From: "Mauricio Fernández" <batsman.geo@...>
Date: 2002-12-11T18:52:14+09:00
Subject: Re: replacing chars in string

On Wed, Dec 11, 2002 at 03:18:05PM +0900, nobu.nokada@softhome.net wrote:
> Hi,
> 
> At Wed, 11 Dec 2002 14:58:28 +0900,
> why the lucky stiff wrote:
> >   n = 1000
> >   str =  "count=(a+b); if(a<=b) d[i]=10;f(a,b)"
> >   test = nil
> >   bm do |x|
> >       x.report( "chained gsubs:" ) do
> >           n.times do
> >               test = str.gsub(/,/,' , ').gsub(/\(/,' ( ').gsub(/\)/,' ) ').gsub(/([^<>])=/,'\1 = ').gsub(/;/,";\n")  
> >           end
> >           # puts
> >           # p test
> >       end
>   x.report( "chained gsubs 2:" ) do
>     n.times do
>       test = str.gsub(/[,()]/,' \& ').gsub(/([^<>])=/,'\1 = ').gsub(/;/,";\n")  
>     end
>     # puts
>     # p test
>   end
> 
> With 10,000 iterations:
> 
>                       user     system      total        real
> chained gsubs:    2.270000   0.020000   2.290000 (  2.306303)
> chained gsubs 2:  2.030000   0.040000   2.070000 (  2.066607)
> grouped gsub:     5.570000   0.060000   5.630000 (  5.758734)
> gsub and case:    3.720000   0.070000   3.790000 (  3.950212)
> 

x.report( "chained gsubs 3:" ) do
    n.times do
        test = str.gsub(/[,()]/,' \& ').gsub!(/([^<>])=/,'\1 = ').gsub!(/;/,";\n")
    end
    # puts
    # p test
end


:) With 100,000 iterations:


      		 user     	system      	total        	real
chained gsubs:   6.270000   	0.020000   	6.290000 	(  6.389039)
chained gsubs 2: 5.760000   	0.020000   	5.780000 	(  5.808392)
chained gsubs 3: 5.620000   	0.000000   	5.620000 	(  5.703204)
grouped gsub:    19.880000   	0.020000  	19.900000 	( 20.185286)
gsub and case:   12.580000   	0.020000  	12.600000 	( 12.791412)

-- 
 _           _                             
| |__   __ _| |_ ___ _ __ ___   __ _ _ __  
| '_ \ / _` | __/ __| '_ ` _ \ / _` | '_ \ 
| |_) | (_| | |_\__ \ | | | | | (_| | | | |
|_.__/ \__,_|\__|___/_| |_| |_|\__,_|_| |_|
	Running Debian GNU/Linux Sid (unstable)
batsman dot geo at yahoo dot com

/*
 *     Please skip to the bottom of this file if you ate lunch recently
 *                             -- Alan
 */
	-- from Linux kernel pre-2.1.91-1