Maximum Number of Words You Can Type LeetCode solution in JavaScript

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var canBeTypedWords = function (text, brokenLetters) {
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  let regexp = "[" + brokenLetters + "]\+";
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  let word = text.split(" "),
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    count = 0;
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  for (let i = 0; i < word.length; i++) {
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    let work = true;
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    // if matches, means word[i] contains malfunction letters.
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    if (word[i].match(regexp)) {
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      work = false;
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    }
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    if (work) {
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      count++;
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    }
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  }
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  return count;
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};