Hi Bhargav,
This is the regular expression for fax format like
+(country code)-(area code)-(fax number)
var regex = new RegExp("\\+[0-9]{1,3}-[0-9]{3}\\-[0-9]{7}");
Or
var regex = new RegExp("^\\+[0-9]{1,3}-[0-9]{3}-[0-9]{7}$");
HTML
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript">
function ValidateFax() {
var regex = new RegExp("^\\+[0-9]{1,3}-[0-9]{3}-[0-9]{7}$");
var fax = document.getElementById("txtFax").value;
if (fax != '') {
if (regex.test(fax)) {
alert("Fax no is valid");
} else {
alert("Fax no is invalid");
}
} else {
alert("Enter Fax no.");
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<input id="txtFax" type="text" />
<input type="button" onclick="ValidateFax()" value="Validate" />
</div>
</form>
</body>
</html>
Demo