Discussion on: Daily Challenge #212 - DNA to RNA

def DNAtoRNA(dna)
  reg_dna = /^(G|C|A|T)*$/i
  if dna.match(reg_dna)
    dna.gsub(/(T|t)/, 'U').upcase
  else
    raise "Not a valid DNA string"
  end
end

const DNAtoRNA = (dna) => {
   const dnaRegex = /^(G|C|A|T)*$/gi
   if (dnaRegex.test(dna)) {
      return dna.replace(/t/gi, 'U').toUpperCase()
   } else {
      throw new Error("Not a valid DNA string")
   }
}

function DNAtoRNA($dna) {
    $dnaRegex = "/^(G|C|A|T)*$/i";
    if (preg_match($dnaRegex, $dna)) {
        return strtoupper(str_ireplace("T", "U", $dna));
    } else {
        throw new \Exception("Not a valid DNA string");
    };
}