HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>Filter contains demo</title>

  <style>

    body { font-family: sans-serif; padding: 16px; }

    .product { padding: 10px; margin: 8px 0; border: 1px solid #ccc; }

    .on-sale { border-color: #059669; background: #ecfdf5; }

  </style>

</head>

<body>

  <div class="product">Winter jacket — regular price</div>

  <div class="product">Summer sale — 50% off today</div>

  <div class="product">New arrivals this week</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("div.product")

      .filter(":contains('sale')")

      .addClass("on-sale");

  </script>

</body>

</html>

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div.product filter :contains('sale') (Try It)