I do like the regex solution though, it's quite elegant.

You can combine my second and third suggestions (for nonexistent codes, this uses the defined-or solution I showed here, the exists solution would work as well):

    (my $amino_acid = $seq) =~ s{(...)}
        { $genetic_code{$1} // 'X' }esg;
    return $amino_acid;

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In reply to Re^3: Translation Substring Error by haukex
in thread Translation Substring Error by FIJI42

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