Use eval. Or use substitution with a hash instead (untested): 
my %translit;
# map chars in $orig to chars in $replace
@translit{split //, $orig} = split //, $replace;

$fname =~ s/(.)/defined($translit{$1}) ? $translit{$1} : $1/eg;

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In reply to Re: How to use a variable in tr/// by ysth
in thread How to use a variable in tr/// by perl-novice

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