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<div>
<input id="phoneNo" type="text" onkeyup="checkPhoneNo(this);" />
<script type="text/javascript">
function checkPhoneNo(o) {
var reg = /^0[\d]+|[^\d]*/g;
o.value = o.value.replace(reg, '');
}
</script>
</div>
<div>
<input id="phoneNo" type="text" onkeyup="checkPhoneNo(this);" />
<script type="text/javascript">
function checkPhoneNo(o) {
var reg = /^0|[^\d]*/g;
o.value = o.value.replace(reg, '');
}
</script>
</div>