Re: font color="#ff0000"IF NOT! IF NOT!/font

Grep returns a list, so I'm not sure what the ! will do... you probably either want

unless(grep /home/, @words) {
  print $words[$x];
}
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Your problem is you need to pass grep an array @words, not part of the array $words[$x]... if $words[$x] contains a sub array you need to dereference it like... @{$words[$x]}

It would help if you said a little more about what the data is

Update Nevermind... from other people responses I see what is going on... yeah, you probably want

print $words[$x] if $words[$x] =~ /home/;
[download]

oops :)

- Ant

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Re: Re: font color="#ff0000"IF NOT! IF NOT!/font by dragonchild (Archbishop) on Aug 02, 2001 at 22:56 UTC
As an aside, the construct `! grep EXPR, LIST` is used in a boolean context. Either grep returns a list or it doesn't. ! evaluates in a boolean context. A list is TRUE and no list is FALSE. I've used it a lot in extended EXPR's, so that I don't have to work through the negation of my && or \|\| that sending if to unless (or vice-versa) would do. -------- /me wants to be the brightest bulb in the chandelier!	[reply] [d/l]
Re3: IF NOT! IF NOT! by Hofmator (Curate) on Aug 03, 2001 at 13:11 UTC
As an aside, the construct ! grep EXPR, LIST is used in a boolean context. Either grep returns a list or it doesn't. ! evaluates in a boolean context. A list is TRUE and no list is FALSE. Not the best way to put it, IMHO ... to clarify: in scalar context grep returns the number of times it matched. So if it didn't match anything, it returns 0 which evaluates to false. Otherwise it returns a positive number which evaluates to true. The boolean context is enforced by the if (and by the !), so that the grep in `if (grep /blah/, @array)`also evaluates in boolean context. -- Hofmator	[reply] [d/l]
Re{4}: IF NOT! IF NOT! by dragonchild (Archbishop) on Aug 03, 2001 at 17:17 UTC
Is it that grep returns a number when evaluated in a scalar context or that grep returns a list which, when evaluated in scalar context, gives the number of matches? I know it sounds like a semantic difference, but I'm just curious. ------ /me wants to be the brightest bulb in the chandelier!	[reply]
Re5: IF NOT! IF NOT! by Hofmator (Curate) on Aug 03, 2001 at 17:43 UTC
Re: Re5: IF NOT! IF NOT! by dragonchild (Archbishop) on Aug 03, 2001 at 17:54 UTC
Re: Re: Re: font color="#ff0000"IF NOT! IF NOT!/font by suaveant (Parson) on Aug 02, 2001 at 22:59 UTC
Ahhh... I wasn't sure... the code had me a bit confused anyway... backwards logic does that :) - Ant	[reply]