Use grep 

use strict;
use warnings;
my @array = qw(KL1_something.txt KL12_anything.dat KL123_rest.txt);
my @file = grep /^KL\d{1,2}_/, @array;
print "@file\n";

[download]
Bill

In reply to Re: quantifiers with digits (\d{1|2} doesn't do what I expect) by BillKSmith
in thread quantifiers with digits (\d{1|2} doesn't do what I expect) by efoss

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