No need to extend the hash (with 0..9) :
(my $output = $filter_clean)
=~ s{ (\D) }{ $filter_map{uc $1} }exg;
If the aim isn't to separate data and function :
use strict;
use warnings;
use 5.10.1;
my $filter_clean = 'GaV18';
sub filter2num {
local $_=shift;
s/[ABC] /2/igx;
s/[DEF] /3/igx;
s/[GHI] /4/igx;
s/[JKL] /5/igx;
s/[MNO] /6/igx;
s/[PQRS]/7/igx;
s/[TUV] /8/igx;
s/[WXYZ]/9/igx;
return $_;
}
say filter2num($filter_clean);
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