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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>String.search()</title>
</head>
<body>
  <pre id="out"></pre>
  <script>
    var paragraph = "I think Ruth's dog is cuter than your dog!";
    var regex = /[^\w\s']/g;
    var index = paragraph.search(regex);
    document.getElementById("out").textContent = [
      index,
      paragraph[index]
    ].join("\n");
  </script>
</body>
</html>

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String.search() — basic (Try It)