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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<input name="tel"/>
  <button class="fixNumber">fix number</button>
</body>
</html>
 
var telInput = document.querySelector('[name="tel"]');
var btn = document.querySelector('.fixNumber');
btn.addEventListener('click', function () {
  alert(telInput.value.replace(/\D/mg, ''));
});
Output

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