From: Rick DeNatale <rick.denatale@...>
Date: 2006-09-05T08:29:32+09:00
Subject: Re: Compiling Regexp only once

On 9/4/06, Robert Klemme <shortcutter@googlemail.com> wrote:

> Note though that it's usually faster to have a regexp in line.  So in
> your case you might have a method that does the line parsing (or
> multiple line parsing) and that's where you can put the inline regexp
> for max efficiency.

Robert,

I'm not sure what you mean by inline, do you mean a regexp literal like
/[ABC]/ vs. RegEx.new('/[ABC]/')  if so that's not clear.

See my benchmarks on the thread about "Ordered contrast for String or
Array," where changing a literal /./ to a constant set to
RegEx.new('/./') caused a 200 fold performance increase.

Not that you always want to do that, benchmarking always beats rules of thumb.

-- 
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/