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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>^ with m</title>
</head>
<body>
  <h1>Start anchor</h1>
  <pre id="out"></pre>
  <script>
    var text = "start here\nnot start\nstart again";
    document.getElementById("out").textContent =
      /^start/.test(text) + "\n" +
      /^start/m.test(text) + "\n" +
      text.match(/^start/gm).join(" | ");
  </script>
</body>
</html>

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JavaScript RegExp m modifier — ^ start of line (Try It)