From: Ruby Newbee <rubynewbee@...>
Date: 2010-01-04T17:54:14+09:00
Subject: Is ruby's regex slower?

Hi,

I wrote this message without other purpose, just show a result for
comparison. :-)

First I got the page which will be used for analysis (got all domain
names from it):

wget http://www.265.com/Kexue_Jishu/

It will get an index.html page.

Then I run this ruby script:

#!/usr/bin/ruby

f = File.open("index.html")

f.each_line do |c|
    puts $1 if /href="http:\/\/(.*?)\/.*" target="_blank"/ =~ c
end

f.close


And this perl script:

#!/usr/bin/perl

open HD,"index.html" or die $!;
while(<HD>) {
    print $1,"\n" if /href="http:\/\/(.*?)\/.*" target="_blank"/;
}
close HD;


When using "time" command to see the running time, I saw ruby is
slower than perl (maybe due to the regex?).

Ruby's:

real    0m0.013s
user    0m0.012s
sys     0m0.000s

Perl's:

real    0m0.004s
user    0m0.004s
sys     0m0.000s

Both versions:

# ruby -v
ruby 1.9.1p243 (2009-07-16 revision 24175) [i686-linux]

# perl -v
This is perl, v5.8.8 built for i486-linux-thread-multi


Yes that's the result, but not influence me to love ruby.


Thanks.
Jenn.