HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ab*c</title>
</head>
<body>
  <h1>Flexible middle</h1>
  <pre id="out"></pre>
  <script>
    var tokens = ["ac", "abc", "abbbc", "abxc"];
    document.getElementById("out").textContent = tokens.map(function (t) {
      return t + " → " + /ab*c/.test(t);
    }).join("\n");
  </script>
</body>
</html>

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JavaScript RegExp * quantifier — ab*c pattern (Try It)