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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>_.escapeRegExp — dots</title>
</head>
<body>
  <h1>Why escape dots</h1>
  <pre id="out"></pre>
  <script src="https://cdn.jsdelivr.net/npm/lodash@4.17.21/lodash.min.js"></script>
  <script>
    document.getElementById("out").textContent =
      new RegExp("report.pdf").test("reportXpdf") + "\n" +
      new RegExp(_.escapeRegExp("report.pdf")).test("reportXpdf") + "\n" +
      new RegExp(_.escapeRegExp("report.pdf")).test("report.pdf");
  </script>
</body>
</html>

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Lodash _.escapeRegExp — why escape dots (Try It)