From: Eric Hodel <drbrain@...7.net>
Date: 2006-07-30T08:04:24+09:00
Subject: Re: Slow regular expressions

On Jul 29, 2006, at 7:52 AM, Caleb Clausen wrote:

> On 7/29/06, Jeremy Henty <jeremy@chaos.org.uk> wrote:
>> Yow!  Calling String#match is 2-3 times as slow!  Why is that?  The
>> overhead of calling the method?
>
> I was curious about this too.
> It looks like it's the effort of computing a MatchData that takes all
> the extra time. This snippet is just as slow as using #match:
>
>  bm.report '=~ literal + $~' do
>    N.times do string =~ /a (.) c\s. e/ ; $~ end
>  end

Yes, it is the work of constructing the MatchData object.

-- 
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net
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