asked on

multiple 'or''s

Hi,

can anyone tell whats wrong here?
this is the output from the debugger for

if ($dd && $ee eq ('a||'b'||'c'||'d')) { dosomething};

when ee equaled c the xpression ee eq ('a||'b'||'c'||'d') still evaluated to false?
when ee was a and b it evaluated correctly....
whats wrong here?

heres the o/p from debugger:

DB<5> x ($dd eq 'a' && $ee eq ('a'||'b'||'c'||'d'))
0 ''
DB<6> x dd
0 'a'
DB<7>
DB<8> $ee

DB<9> x $ee
0 'c'

DB<14> x ($ee eq ('a'||'b'||'c'||'d'))
0 ''
DB<15>

Vlearns

ASKER

it didnt worlk for ee equals d or b
it works only for a

how to define this such that it is true when either of a b c or d is true

Vlearns

ASKER

how to define a expression such that value is true if ee equals one of a, b,c, or d

SOLUTION

kandura

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kandura

or
$ee =~ /^[a-d]$/

Vlearns

ASKER

yes it evaluates to first a
i wrote to ((ee eq a)||(ee eq b) || () ||())

to correct that but looking for a better sol

Vlearns

ASKER

or operators in perl dont worlk loike in C
not very familiar with perl

in ur soln $ee =~ /^a|b|c|d$/

^ means matches at the start and $ means matching at end?
in general if i need $ee =~/^ant/man/sky/earth$/

will this match if ee is one of these?

the dollar towards the end means

ASKER CERTIFIED SOLUTION

ozo

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ozo

$ee="trotskyism";
$ee =~/^ant|man|sky|earth$/
will match

You must use
$ee =~/^(ant|man|sky|earth)$/
to match "sky" exactly.

ozo

Actually
$ee =~/^(ant|man|sky|earth)$/
will also match "ant\n" or "man\n" or "sky\n" or "earth\n"
better to use
$ee =~/\A(ant|man|sky|earth)\z/
see
perldoc perlre

ozo

In Perl6 you will be able to say
if( $ee eq any('a'..'d') ){
You can also use that construct in Perl5 if you
use Quantum::Superpositions;

Vlearns

ASKER

Thanks folks