No need to use a hash if you're just reading numbers from a file. Use an array instead:
#!/usr/bin/perl
use strict;
use warnings;
my $file = 'AXP_FACS.DAT';
open my $FH, '<', $file or die "Error opening file: $!";
my @faclist = (<$FH>); % Read all lines into the array
close $FH;
chomp @faclist; % Remove newlines from each entry.
my @numbers = 1..5000;
foreach my $integer ( @numbers ) {
unless ( grep { /\b$integer\b/ } @faclist ) {
print "Not found: $integer\n";
}
}
The '\b' at the start and end of the grep regular expression matches the entire number, not just a single digit.
njcodewarrior
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