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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>isRegExp — guard</title>
</head>
<body>
  <h1>Safe .test() guard</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    function matches(matcher, text) {
      if (!_.isRegExp(matcher)) {
        return false;
      }
      return matcher.test(text);
    }
    document.getElementById("out").textContent = [
      String(matches(/ad/, "Ada")),
      String(matches("/ad/", "Ada")),
      String(matches(null, "Ada"))
    ].join("\n");
  </script>
</body>
</html>

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Lodash _.isRegExp — safe .test() guard (Try It)