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  <title>Lodash isRegExp — primitives</title>
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  <h1>_.isRegExp — primitives &amp; nullish</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    (function () {
      document.getElementById("out").textContent =
        "num: " + _.isRegExp(42) + "\n" +
        "nullVal: " + _.isRegExp(null) + "\n" +
        "undef: " + _.isRegExp(undefined);
    })();
  </script>
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Lodash _.isRegExp — primitives & nullish (Try It)