Array and Hash

waytoperl has asked for the wisdom of the Perl Monks concerning the following question:

Hello,

The content of DATA are modified %hash value. Need to include %hash key before or after SOME_DATA to respective modified %hash key

Don't know how to search modified value and include respective key after or before SOME_DATA

__HASH__

$VAR1 = {
'Key1' => 'Cat.Mouse.Game.Lion.Tiger.Elephant',
'Key2' => 'Cat.Mouse.Game.Lion.Tiger.Lion',
'Key3' => 'Cat.Mouse.Game.Lion.Tiger.Monkey',
};
[download]

__DATA__

Pigeon.Lion.Tiger.Elephant SOME_DATA
Pigeon.Lion.Tiger.Lion SOME_DATA
Pigeon.Lion.Tiger.Monkey SOME_DATA
[download]

__Example code__

my %hash = ()
my $file = 'master.txt';
open (my $OUT_FILE, '<', "TEXT_FILE") or die "ERROR";

while (<$OUT_FILE>)  {   
    print "$. \n" if /SOME_DATA/; #searching SOME_DATA and printing
}
[download]

__OUTPUT__

Pigeon.Lion.Tiger.Elephant SOME_DATA (Key1)
Pigeon.Lion.Tiger.Monkey SOME_DATA (Key3)
[download]

UPDATED:

%hash value "Cat.Mouse.Game" is replaced with "Pigeon" and placed in a text file along with SOME_DATA

Ignore "Pigeon" and match other characters. If there is a match, then include respective %hash Key before "SOME_DATA"

Comment on Array and Hash Select or Download Code

Replies are listed 'Best First'.
Re: Array and Hash by GrandFather (Saint) on Nov 23, 2014 at 22:39 UTC
Your "question" makes no sense to me (see I know what I mean. Why don't you?). Take your time writing up the issue and try for full sentences. Make your example data as real as you can so important information isn't "lost in translation". You mention "modified hash value", but don't mention what modification is acceptable. Perl is the programming world's equivalent of English	[reply]
Re: Array and Hash by 2teez (Vicar) on Nov 24, 2014 at 02:51 UTC
Hi waytoperl, Considering, the __DATA__ and the hash data presented, there is no way you are getting this desired output `Pigeon.Lion.Tiger.Elephant SOME_DATA (Key1) Pigeon.Lion.Tiger.Monkey SOME_DATA (Key3)` [download] Why? If "Pigeon." and " SOME_DATA" is taken away from your input coming from __DATA__, compare with your hash data if "Cat.Mouse.Game." is taken away you practically have these: Lion.Tiger.Elephant Lion.Tiger.Lion Lion.Tiger.Monkey With " SOME_DATA" common to all input, one cannot use it to differentiate, when comparing with the hash data given. And with the OP update given, all compared data will match, except if there is some kind of changed in input data. Then would the (key2) not match Something like this: `use warnings; use strict; my %hash = ( 'Key1' => 'Cat.Mouse.Game.Lion.Tiger.Elephant', 'Key2' => 'Cat.Mouse.Game.Lion.Tiger.Lion', 'Key3' => 'Cat.Mouse.Game.Lion.Tiger.Monkey', ); while ( my $data = <DATA> ) { chomp($data); my $value = join '.' => ( split /[\s.]/, $data )[ 1 .. 3 ]; print map { "$data ($_)\n" if $hash{$_} =~ /$value/ } keys %hash; } __DATA__ Pigeon.Lion.Tiger.Elephant SOME_DATA Pigeon.Lion.Tiger.SeaLion SOME_DATA Pigeon.Lion.Tiger.Monkey SOME_DATA` [download] OUTPUT `Pigeon.Lion.Tiger.Elephant SOME_DATA (Key1) Pigeon.Lion.Tiger.Monkey SOME_DATA (Key3)` [download] Please note that the input data has been changed from what the OP gave. With the OP input, the output will be: `Pigeon.Lion.Tiger.Elephant SOME_DATA (Key1) Pigeon.Lion.Tiger.Lion SOME_DATA (Key2) Pigeon.Lion.Tiger.Monkey SOME_DATA (Key3)` [download] If you tell me, I'll forget. If you show me, I'll remember. if you involve me, I'll understand. --- Author unknown to me	[reply] [d/l] [select]
Re: Array and Hash by Loops (Curate) on Nov 23, 2014 at 22:49 UTC
Hello. You lost me a bit about the mapping between the input text file and the hash. The values don't match and yet you want Key1 and Key3 in your output? I'm going to assume that was a typo, and what you're asking is to match that first string on each input line to the values contained in your hash: `my %hash = ( Key1 => 'Pigeon.Lion.Tiger.Elephant', Key2 => 'Pigeon.Lion.Tiger.Rabbit', Key3 => 'Pigeon.Lion.Tiger.Monkey', ); my %lookup = reverse %hash; while (<DATA>) { chomp; my ($value) = split; my $key = $lookup{$value}; print "$_ ($key)\n" if /SOME_DATA/ and defined $key; } __DATA__ Pigeon.Lion.Tiger.Elephant SOME_DATA Pigeon.Lion.Tiger.Lion SOME_DATA Pigeon.Lion.Tiger.Monkey SOME_DATA` [download] Prints: `Pigeon.Lion.Tiger.Elephant SOME_DATA (Key1) Pigeon.Lion.Tiger.Monkey SOME_DATA (Key3)` [download] Hopefully that looks right to you. The main hash is reversed so we can use %lookup to find matching values and discover the associated key. Reverse will put the values into the keys, with their respective keys as values. Everything else falls into place.	[reply] [d/l] [select]
Re: Array and Hash by wjw (Priest) on Nov 23, 2014 at 23:22 UTC
As close as I can tell, you want to correlate the hash->key to SOME_DATA which resides in __TEXT__FILE__DATA__ using hash->value = string in __TEXT__FILE__DATA__. That will be hard to do being that the string in __TEXT__FILE__DATA__ does not match the value you show in hash->key. I think I might: modify all hash->values to get rid of 'Cat.Mouse.Game' read the text file into a separate hash getting rid of Pigeon as I do so. step through the values of the hash modified in step one looking for a matching key in the hash from step two upon match, output the key from hash in step one, the value from hash in step two along with its key. If I understood the desired output, that should give it to you(though key first), and should run pretty fast too. Hope that helps.... ...the majority is always wrong, and always the last to know about it... Insanity: Doing the same thing over and over again and expecting different results... A solution is nothing more than a clearly stated problem...otherwise, the problem is not a problem, it is simply an inconvenient fact wjw	[reply]