@array2 =~ /$code/; will give you a warning. Did you read the warning message? You cannot test an RE against an array like that.
grep is sometimes useful for that, but in your case you need another solution, of which there are many.

Here is mine:
#!/usr/bin/perl
use strict;        # Always use strict
use warnings;

# Always test the return value from open
open(my $fh1,"file1.txt") or die "Unable to open file1:$!";
my @array1=<$fh1>;
close($fh1);
chomp @array1;

# Create a hash using the code values from file1
my %hash;
@hash{@array1} = undef;

# Create an RE pattern from code values from file1
my $pattern = join ('|', @array1);

open(my $fh2,"file2.txt") or die "Unable to open file2:$!";;

# If we find the code, increment the count in the hash
for my $line (<$fh2>)
{
    chomp $line;
    if ($line =~ /($pattern)/) {
        $hash{$1}++;
    }        
}
close($fh2);

# Print out the hash
for my $code (keys %hash) {
    print "$code $hash{$code}\n"
}

[download]

In reply to Re: match and count the number of times by cdarke
in thread match and count the number of times by vis1982

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.