The problem statement is a little vague. Perhaps see How to ask better questions using Test::More and sample data? Anyway here might be what you want.

use strict;
use warnings;

use Test::More tests => 1;

my $vmstr = 'zldcdabcdef14-vos-fxohr-correlator-00';

my ($digits) = $vmstr =~ /-(\d\d)$/;

my $instance = "/instance-$digits";

is $instance, '/instance-00';

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In reply to Re^9: To read files from two dir by hippo
in thread To read files from two dir by pragovnj

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