From: Kirk Haines <wyhaines@...>
Date: 2009-08-07T00:50:03+09:00
Subject: [ruby-core:24797] Re: Proposal: match? with no backrefs

On Tue, Aug 4, 2009 at 9:37 PM, NARUSE, Yui<naruse@airemix.jp> wrote:
> 2009/08/03 9:04, Yehuda Katz wrote:
>>
>> In both of those cases, $1 is set.
>
> $1 is virtual variable.
> The value of $1 is created when it is called.

I think what Yehuda is getting at, though, is that:

'abcdefghijklmnopqrstuvwxyz' =~ /nop/

is quite a bit faster than:

'abcdefghijklmnopqrstuvwxyz' =~ /n(op)/

So it would be nice to be able to:

r = /n(op)/
'abcdefghijklmnopqrstuvwxyz'.match?(r)

And have that run as fast as a /nop/ version, since it need not
actually act on the backreference creation in this instance.

Did I interpret your intent correctly, Yehuda?


Kirk Haines