I am first curious as to where the information you have provided came from. If you have already extracted just that string, then it might be a simple regexp to extract that information.

Second, I would like to know whether you already have determined that the two file names are using said identifiers. Namely, I would like to know how you're going to plan on determining the difference between a BASE_ID and a REVISION_ID.

I've had to do something similar with a parsing program that I have. The details are not important, but I had it set up like this (I'll use you're info). You'll notice that in this situation, I didn't need a regexp -- but you might need to (and thus the reason why the above information might be important). If you're creating these file names, just use the joining functions.

Template: myfile!BASE_ID!.xxx

#!/usr/bin/perl
use strict;

my $Base_ID = getBaseID();  # some subroutine that gets this

my $filename = "myfile" . $Base_ID . ".xxx";
print $filename;

# eof
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--Coplan