Leon wrote:
>
> Without using $key == $cid,
> How to construct a pattern so that $key match $cid.
> I do not understand why in the undermentioned script, $key match $cid.
> All explanations would be very much appreciated.
> Thanks
>
> use strict;
> my $cid = '';
> my $key = '1234';
> if ($key=~/\b$cid\b/) {
> print 'true';
> }else {print 'false'};
>
$cid is an empty string.
So in reality there's written $key =~/\b\b/.
\b stands for a word boundary and has a length of 0.
In $key there are two word boundary,
before the 1 and after the 4.
So of course, where one word boundary is,
there are two or three or million ones.
(They all have a length of 0)
Greetings,
Andrea
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