For checking whether a list contains an element matching certain criteria or not, grep is a natural choice (natural for me, anyway). So if you merely need to know whether this retCode occurs, you could do this (based on toolic's script): 

#!/usr/bin/perl

use strict;
use warnings;
use feature qw/say/;

my @retCodes_values;

while (<DATA>) {
    next unless /retCode\=/;
    chomp;

    my ($string, $exit_code) = split /retCode\=/, $_, 2;
    push @retCodes_values, [ $string, $exit_code ];
}

if(grep { $_->[1] == 3 } @retCodes_values) {
    say "retCode=3 occurred!"
}

__DATA__
15288 :: Mon Mar 2 13:23:32 2015::App.pm:status returned with retCode=
+1
15288 :: Mon Mar 2 13:24:32 2015::App.pm:status returned with retCode=
+3
15288 :: Mon Mar 2 13:25:32 2015::App.pm:status returned with retCode=
+4
15288 :: Mon Mar 2 13:23:32 2015::App.pm:status returned with retCode=
+5

[download]

If you also need information on e.g. the associated log message, just save grep's result to another array.

In reply to Re^5: Do not run code even if one element has matched exit code value by AppleFritter
in thread Do not run code even if one element has matched exit code value by jayu_rao

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