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The transliteration does not interpolate the variable as you expect in your sample. The following illustrates the use of eval.
use strict; use warnings; my @letters = qw (A B C D E F); my $string = "AFTYUBEWTWECRTUTYIYTDDDDRYJURTHJTREEEEEFGSDFF"; my $count; foreach my $a(@letters) { eval "\$count = \$string =~ tr/$a//"; print "$count\n"; }
You can also use a substitution in order to interpolate but avoid the eval.
$count = $string =~ s/$a//g;
Both methods change the string. A more flexible way to count the values would be to split the string and use a hash to store the values.
my %count; $count{$_}++ foreach split //, $string; print "$count{$_}\n" foreach (@letters);

In reply to Re: This should be easy: counting letters in a string by inman
in thread This should be easy: counting letters in a string by Anonymous Monk

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