From: 7stud -- <bbxx789_05ss@...>
Date: 2007-10-28T12:21:48+09:00
Subject: Re: convert string format

Brian Adkins wrote:
> 
> Yeah, but scanf is implemented in Ruby, so it's 25 times slower (at
> least by a crude, quick benchmark) than unpack or insert :(
>

This one is super speedy:

str = '20070801'
new_str = sprintf("%4s/%2s/%2s", str, str, str)


On my system sprintf() is twice as fast as unpack(), which is twice as 
fast as match().


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