Re: help about regex matching

Jeff Pang wrote:
> yes,John's code work well too.But I still don't know why this code
> can't run correctly:
>
> next unless /(\S+).*(\d+\.\d+\.\d+\.\d+)/s;
>
> When I run it,I get these results:
>
> 364 2.168.2.20
> 286.4 2.168.2.21
> 264.4 2.168.2.22
> 138 2.168.2.23
> 562.3 2.168.2.24
> 80.7 2.168.2.25
> 355 2.168.2.26
> 266.5 2.168.2.27
> 327 2.168.2.28
>
>
> somethings as '19' have lost.

That is because .* is greedy and will match everything to the end of the
string and then backtrack until (\d+\.\d+\.\d+\.\d+) matches which specifies
that the first \d+ only has to match at least one digit.

Since the two fields start and end with digits you could do this instead:

next unless /([\d.]+)\D+(\d+\.\d+\.\d+\.\d+)/;


John
--
use Perl;
program
fulfillment
.

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