Untitled

callonkeyup(this,'AccountNumber',this.getAttribute('reqpattern'))

<input type="tel" reqpattern="^[0-9]+$"
  onblur="callonkeyup(this,'AccountNumber',this.getAttribute('reqpattern'));"
  value="" id="AccountNumber"/>

<input type="tel" onblur="callonkeyup(this,'AccountNumber', '^[0-9]+$');" value="" id="AccountNumber"/>

<!DOCTYPE html>
<html>
<head>
<title>Test</title>
<script src="http://code.jquery.com/jquery-1.9.1.min.js"></script>
</head>
<body>
<input type="tel" reqpattern="^[0-9]+$"
  onblur="callonkeyup(this,'AccountNumber',this.getAttribute('reqpattern'));"
  value="" id="AccountNumber"/>
<input type="tel" reqpattern="^[a-z]+$"
  onblur="callonkeyup(this,'AccountName',this.getAttribute('reqpattern'));"
  value="" id="AccountName"/>

<script>
function callonkeyup(obj,txtType,rpattern)
{
    alert(obj);
    alert(txtType);
    alert(rpattern);
}

</script>
</body>
</html>