Decrypt String from Alphabet to Integer Mapping LeetCode solution in JavaScript

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/**
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 * @param {string} s
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 * @return {string}
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 */
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var freqAlphabets = function (s) {
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  return s
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    .match(/\d{2}(?=#)|\d/g)
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    .map((num) => String.fromCharCode(96 + +num))
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    .join("");
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};