Regex lookahead example not as stated in Camel 4th

[Bob MacCallum]

I was thinking you'd have to use something like this

perl -wE 'say for "0123456789" =~ /(\d(?=(\d{2})))/g'
0
12
1
23
2
34
3
45
4
56
5
67
6
78
7
89

obviously with some post-processing required.



On Wed, Jun 19, 2013 at 3:28 PM, 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.
>
>
>
>
>
>
> On Wed, Jun 19, 2013 at 3:02 PM, gvim <gvimrc at gmail.com> wrote:
>
>> On 19/06/13 14:52, Abigail wrote:
>>
>>
>>> That's not a lookahead assertion. This is:
>>>
>>>    $ perl -wE 'say for "0123456789" =~ /(?=(\d{3}))/g'
>>>    012
>>>    123
>>>    234
>>>    345
>>>    456
>>>    567
>>>    678
>>>    789
>>>    $
>>>
>>>
>>>
>> So there's a typo on p.248
>>
>> gvim
>>
>
>