HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Word validation</title>
</head>
<body>
  <h1>Word validation</h1>
  <pre id="out"></pre>
  <script>
    var wordPattern = /^[abc]+$/;
    document.getElementById("out").textContent =
      wordPattern.test("bac") + "\n" +
      wordPattern.test("ccab") + "\n" +
      wordPattern.test("back") + "\n" +
      wordPattern.test("ABC");
  </script>
</body>
</html>

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JavaScript RegExp [abc] — word validation (Try It)