chop should be chomp.

"$3" should be $3.

"$msg" should be$msg.

"$val" should be $val.

Why are you using a substitution instead of if ($_ =~ /^(\D+.*\d{4}\s+)(\D+.*)(\w{11})$/?

$_ =~ can be omitted.

It's bad to use $1, $2, etc after calling a function after they've been set.

fmt_rpt($msg) should probably be $msg = fmt_rpt($msg).

And the answer to your question: $val .= "$msg"; should $analysis{$key} .= $msg. I'm not sure if that's exactly what you want, but you never save $val into the hash, so your problem is definitely here.

$val is used but never set in the else part of the if.

And the answer to your question: $val .= "$msg"; should $analysis{$key} .= $msg. I'm not sure if that's exactly what you want, but you never save $val into the hash, so your problem is definitely here.

$1 is never used. I'm going to leave the capture in the code below, in case you plan on using $1.

Fixed code:

            while(<RPT>)
            {
                chomp;
                if (/^(\D+.*\d{4}\s+)(\D+.*)(\w{11})$/)
                {
                    $key = $3;
                    $msg = $2;

                    # Maybe should be: $msg = fmt_rpt($msg);
                    fmt_rpt($msg);

                    if (exists($analysis{$key}))
                    {
                        $analysis{$key} .= $msg;
                    }
                    else
                    {
                        $analysis{$key} = $msg;
                    }
                }
                else
                {
                    print "Program Error 2\n";
                    exit 1;
                }
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