Besides wrog's suggestion to enclose them in double quotes, you can export them, then they will be accessible in Perl via %ENV

#!/usr/bin/bash

# do other processing

# export the desired variables
export OPC_MSG_TEXT OPC_MSG_CODE

# use Perl for further processing
ovo-test.pl
[download]

#!/usr/bin/perl
use strict;
use warnings;
my $text = $ENV{OPC_MSG_TEXT};
my $code = $ENV{OPC_MSG_CODE};
...;
[download]