#!/usr/bin/perl -w
use strict;
my $toBeSubstituted = "A-D";
my $myPattern = "[$toBeSubstituted]\\d{2}";
my $myTestString = "A99 B23 C34 D45 E55";
print "The test string is: '$myTestString'.\n";
print "The pattern is: '$myPattern'.\n";
if ($myTestString =~ m/$myPattern/)
{
 print "There was a match: '$&'.\n";
}
else
{
 print "There was no match.";
}