42 chars in the sub.
use strict;
my $s = "abcdefghijklmnopqrstuvwxyz";
my $t = "for";
print x($s,$t),"\n";
$t="perl";
print x($s,$t),"\n";
sub x{
my($s,$t)=@_;
eval"\$s=~tr/$t//cd";
$s eq$t;
}
update
one less: sub x{
eval"\$_[0]=~tr/$_[1]//cd";$_[0]eq$_[1];
}
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