Like tobyink I think a regex solution is simpler and I would add the lower case letters to your look-up hash rather than uc'ing each letter or string in turn.
use strict;
use warnings;
use 5.010;
my @lettersPerButton = ( 3, 3, 3, 3, 3, 4, 3, 4 );
my @buttons = map { ( $_ ) x shift @lettersPerButton } 2 ..
+ 9;
my %filterMap = map { $_ => shift @buttons } q{A} .. q{Z};
$filterMap{ lc( $_ ) } = $filterMap{ $_ } for q{A} .. q{Z};
my @toClean = qw{
GAV18
gAv18
peter
Bill34
};
foreach my $filterClean ( @toClean )
{
( my $filter = $filterClean ) =~ s{([A-Za-z])}{$filterMap{ $1 }}g;
say qq{$filterClean --> $filter};
}
The output.
GAV18 --> 42818
gAv18 --> 42818
peter --> 73837
Bill34 --> 245534
I hope this is of interest.
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