Or maybe you want 
sub main {
  my $input_qfn   = "input.file";
  my $pattern_qfn = "pattern.file";

  my %emailAddresses;
  {
    open(my $input_fh, '<', $input_qfn)
      or die("Can't open input file \"$input_qfn\": $!\n");

    while (<$input_fh>) {
      chomp;
      my ($userName, $emailAddress, $division, $fullName) = split /\|/
+;
      ++$emailAddresses{$emailAddress};
    }
  }

  open(my $pattern_fh, '<', $pattern_qfn)
    or die("Can't open pattern file \"$pattern_qfn\": $!\n");

  while (<$pattern_fh>) {
    chomp;
    if ($emailAddresses{$_}) {
      print "$_ exists in the input file\n";
    } else {
      print "$_ doesn't exist in the input file\n";
    }
  }
}

[download]
Randall@domain.com doesn't exist in the input file
David@domain.com exists in the input file
Rob@domain.com doesn't exist in the input file
Tania@domain.com exists in the input file

[download]

In reply to Re^2: Look for pattern in file. ???? by ikegami
in thread Look for pattern in file. ???? by davidinottawa

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.