It's only getting compiled once, just as if it was outside of eval, so what's the problem?

If you wanted to reuse the counter, make a sub if it: 

$counters{$_} = eval "sub { \$_[0] =~ tr/\Q$_\E// }";

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In reply to Re^3: Simple Matching by ikegami
in thread Simple Matching by rnroot

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