From: Arun Kumar <arun.einstein@...>
Date: 2009-04-30T16:48:27+09:00
Subject: Re: Random Access using IO#pos in code blocks

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Thank you so much for all the responses :-)

On Thu, Apr 30, 2009 at 12:37 PM, Brian Candler <b.candler@pobox.com> wrote=
:

> Robert Klemme wrote:
> > String#scan is likely faster than manually matching portions with
> > #match.  In both versions of Ruby you can do this to get the
> > /character/ offset:
> >
> > irb(main):001:0> s=3D%{foo bar baz}
> > =3D> "foo bar baz"
> > irb(main):002:0> s.scan(/\w+/) { p $`.length }
> > 0
> > 4
> > 8
> > =3D> "foo bar baz"
>
> Well, my guess is that would be *less* efficient for large paragraphs,
> since $` forces allocation of a new string containing all the text from
> the start to the current point. But that reminds me, there is a global
> variable containing a MatchData object: $~
>
> So you can write:
>
> irb(main):001:0> s=3D%{foo bar baz}
> =3D> "foo bar baz"
> irb(main):002:0> s.scan(/\w+/) { p $~.begin(0) }
> 0
> 4
> 8
> =3D> "foo bar baz"
>
> Regards,
>
> Brian.
> --
> Posted via http://www.ruby-forum.com/.
>
>


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