First,
<rant>
warnings and strict are for catching problems at this very stage of development The very first thing you should type in any perl program is..

#!/usr/bin/perl -w

use strict;
[download]

If you were going to add or remove strict or warnings, that would be after the code was frozen.
</rant>

OK.. your issue: I think you're trapped by the notion that you have to use a regex to match that number. You don't. You do need one to capture it though. Why not just capture it to $1 or $2 or whatever it happenes to be in the pattern match and then use what was designed for this very thing... a hash. Store all of your cell site codes as the key and whatever is associated with that as the value. Then just do a ..

if $cellsites{$1} {
    print "Cell site is: $cellsites{$1}\n";
}
else {
    print "No cell site information for $1\n"
}
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Or whatever you want to do with $1.

Hope this helps..
Rich

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