From: Josh Cheek <josh.cheek@...>
Date: 2010-04-01T02:16:25+09:00
Subject: Re: return number of spaces at the beginning of a line

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On Tue, Mar 30, 2010 at 9:35 AM, Robert Klemme
<shortcutter@googlemail.com>wrote:

>  I'm afraid, that is not correct; the String is created as a side
> effect and stored in a global variable:
>
> irb(main):001:0> str = "   foo"
> => "   foo"
> irb(main):002:0> str =~ /[^ ]/
> => 3
> irb(main):003:0> $&
> => "f"
>
> And it has the disadvantage over str[/\A */].length that likely is
> slower because of the alternative.
>
>
>
There was a blog by Yehuda Katz that implied to me that these globals
weren't set until you asked for them, but upon re-reading, it isn't really
clear to me what actually happens
http://yehudakatz.com/2010/02/25/rubys-implementation-does-not-define-its-semantics/

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