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Postings from March 2002
Okay, that makes a little more sense.
-----Original Message-----
From: Jeff 'japhy' Pinyan [mailto:jeffp@crusoe.net]
Sent: Monday, March 04, 2002 1:31 PM
To: Timothy Johnson
Cc: beginners@perl.org
Subject: RE: Comparing to many possibles
On Mar 4, Timothy Johnson said:
> I still am not convinced that all of the hoopla about \z is really
>necessary. I guess the question I need answered before I go back and
change
>anything is this: How is the user supposed to enter an extra \n without
>exiting the prompt? What I mean is, the only situation in which this could
>make a difference is if you concede that a user can somehow enter a \n
>character into a prompt without returning that value back to your script.
>Otherwise it's your fault if you don't chomp their response.
If I am asked how to convert
if ($x eq 'y' or $x eq 'z') { ... }
to a regex, I will give the correct answer:
if ($x =~ /^[yz]\z/) { ... }
Using $ changes the range of accepted answers. That is why I use \z
instead of $. If the question asked was something like "how can I see if
the user entered 'y' or 'z' as input?" I would probably use $ because
there is no way of determining whether the person asking has chomp()ed or
not.
--
Jeff "japhy" Pinyan japhy@pobox.com http://www.pobox.com/~japhy/
RPI Acacia brother #734 http://www.perlmonks.org/ http://www.cpan.org/
** Look for "Regular Expressions in Perl" published by Manning, in 2002 **
<stu> what does y/// stand for? <tenderpuss> why, yansliterate of course.
[ I'm looking for programming work. If you like my work, let me know. ]
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