Regex lookahead example not as stated in Camel 4th

[Gianni Ceccarelli]

On 2013-06-19 Bob MacCallum <uncoolbob at gmail.com> wrote:
> so, forgetting the typo for a moment, why doesn't it output
> 012
> 012
> 012
> 012
> ...
> ?
> 
> From my reading of the 5.12 perlre docs, there is no mention of
> moving the cursor along by one position after each match.  Maybe
> that is a more general thing I wasn't aware of.

L<perlre/Repeated Patterns Matching a Zero-length Substring>

Summary: since C<//g> would be an infinite loop, Perl breaks it for
you, advancing the C<pos()> by one after each (0-len) match.

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