How about something as simple as:

#!/usr/bin/perl

my $text = "Nuera Communications, Inc., ProductFamily: ORCA Series, Pr
+oduct: RDT-8, SoftwareVersion: rdtg7.0.4.7, HardwareRevision:";

$text =~ /SoftwareVersion: (.+),/ig;
print $1, "\n";
[download]

Assuming what you are looking for always starts with the same text. In this case, replacing the Nuera Communications... with Vertical Horizon... does return nothing. Maybe I'm not fully understanding your problem but if it starts with an identifier (like SoftwareVersion) and then is followed by what you want, I think this is the easiest way to get it.