PERL Miscellaneous - Re: noob question: Trying to extract part of a string in a variableto

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Re: noob question: Trying to extract part of a string in a variableto

John W. Krahn

2004-05-19, 8:31 pm

Paul Lalli wrote:
>
> On Wed, 19 May 2004, cayenne wrote:
>
>
> The parens around $user_id force the binding operation of =~ to be
> evaluated in list context. This is done because a pattern match in list
> context returns a list of all of the captured matches (ie, the things that
> go into $1, $2, etc). This is a shorthand way of writing the two
> statements:
>
> $mail_address =~ m/([\w.-+=]+)@/
> my $user_id = $1;

They are not the same at all. If the match fails the first will set
$user_id to undef but your version will set $user_id to the contents of
a previously successful match's capturing parentheses or ''.

John
--
use Perl;
program
fulfillment

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