HTML Code

<!DOCTYPE html>

<html lang=en>

<head>

  <meta charset=UTF-8>

  <meta name=viewport content="width=device-width,initial-scale=1">

  <title>pattern — phone number</title>

  <style>body{font-family:system-ui,sans-serif;margin:0;padding:1.5rem;background:#f8fafc;color:#334155;line-height:1.7}h1{margin:0 0 .75rem;font-size:1.25rem;color:#0f172a}label{display:block;margin-bottom:.35rem;font-weight:500;font-size:.875rem}input{width:100%;max-width:320px;padding:.5rem .65rem;font:inherit;border:1px solid #cbd5e1;border-radius:6px}button{margin-top:.75rem;padding:.5rem 1rem;font:inherit;cursor:pointer;border-radius:6px;border:1px solid #cbd5e1;background:#2563eb;color:#fff}.hint{font-size:.8125rem;color:#64748b;margin-top:.5rem}#status{margin-top:.75rem;font-size:.875rem;font-weight:600}</style>

</head>

<body>

  <h1>pattern on phone input</h1>

  <form id=phoneForm>

    <label for=phone>Phone number:</label>

    <input type=tel id=phone name=phone pattern=\d{3}-\d{3}-\d{4} placeholder=555-123-4567 title="Enter phone as XXX-XXX-XXXX" required>

    <p class=hint>Format: XXX-XXX-XXXX (e.g. 555-123-4567)</p>

    <button type=button id=checkBtn>Check validity</button>

    <p id=status aria-live=polite>Try 555-123-4567 or an invalid value.</p>

  </form>



  <script>var phone=document.getElementById("phone"),status=document.getElementById("status");document.getElementById("checkBtn").addEventListener("click",(function(){status.textContent=phone.checkValidity()?"Valid — matches pattern.":"Invalid — use XXX-XXX-XXXX.",status.style.color=phone.checkValidity()?"#166534":"#b45309"}))</script>

</body>

</html>

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HTML pattern Attribute — phone number format