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Concatenating patterns and finding the number of occurences

PerlBeginner31
Novice

Apr 10, 2014, 10:35 PM

Post #1 of 2 (2579 views)

Concatenating patterns and finding the number of occurences	Can't Post

The following code doesnt work correctly.

Text File:
HEYi dfjhfk HEY
HEYi
HEYi HEYi
HELLOi HELLOi
HELLOi
HELLOi HELLOi

Script:

use strict;
use warnings;
open FILE, "SAMP.txt" or die $!;

my %hash;
while (<FILE>) {
foreach ($_ =~ /(HEY|HELLO)(i)/g) {
my $wrd = $1.$2;
$hash{$wrd}++;
}
}

foreach my $key (keys %hash)
{
print "$key: $hash{$key}\n";
}

O/P:
HEYi: 8
HELLOi: 10

The o/p is double the actual count. Can someone help me point out the mistake in the code?

In my sample text I will have some strings common for 2 or more patterns. So I want to use OR operator for one part of the string. Please help.

BillKSmith
Veteran

Apr 11, 2014, 5:25 AM

Post #2 of 2 (2437 views)

Re: [PerlBeginner31] Concatenating patterns and finding the number of occurences [In reply to]	Can't Post

Your inner loop runs twice for each match. (Once for the HE... and once for the i)

Code

use strict; 
use warnings; 
#open FILE, "SAMP.txt" or die $!; 
*FILE = *DATA; 
 
my %hash; 
while (<FILE>) { 
    foreach ( /(HE(?:Y|LLO)i)/g ) { 
        $hash{$_}++; 
    } 
} 
 
foreach my $key ( keys %hash ) { 
    print "$key: $hash{$key}\n"; 
} 
__DATA__ 
HEYi dfjhfk HEY  
HEYi  
HEYi HEYi  
HELLOi HELLOi  
HELLOi  
HELLOi HELLOi

Good Luck,
Bill

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