From: James Edward Gray II <james@...>
Date: 2006-02-13T03:30:25+09:00
Subject: Re: Cutting a piece of text

On Feb 12, 2006, at 12:08 PM, Marcin Miel��y��ski wrote:

> James Edward Gray II wrote:
>
>>  >> "<lyrics artist=XXX album=XXX title=XXX> Lalalalala </ 
>> lyrics>".sub(/<(\w+)[^>]+>/, "<\\1>")
>> => "<lyrics> Lalalalala </lyrics>"
>
> reluctant would a bit faster:
>
> p "<lyrics artist=XXX album=XXX title=XXX> Lalalalala </ 
> lyrics>".gsub(/<(\w+).*?>/, "<\\1>")

Are you sure?

$ ruby regexp_time.rb
Rehearsal -------------------------------------------------
/<(w+)[^>]+>/   7.210000   0.030000   7.240000 (  7.266166)
/<(w+).*?>/     7.710000   0.020000   7.730000 (  7.757304)
--------------------------------------- total: 14.970000sec

                     user     system      total        real
/<(w+)[^>]+>/   7.170000   0.030000   7.200000 (  7.227075)
/<(w+).*?>/     7.730000   0.020000   7.750000 (  7.777196)
$ cat regexp_time.rb
#!/usr/local/bin/ruby -w

require "benchmark"

tests = 1000000
data  = "<lyrics artist=XXX album=XXX title=XXX> Lalalalala </lyrics>"

Benchmark.bmbm do |x|
   x.report("/<(\w+)[^>]+>/") do
     tests.times { data.sub(/<(\w+)[^>]+>/, "<\\1>") }
   end
   x.report("/<(\w+).*?>/") do
     tests.times { data.sub(/<(\w+).*?>/, "<\\1>") }
   end
end

__END__

;)

James Edward Gray II