JavaScript Program Check Phone Number Format Using Regular Expression

JavaScript Program Check Phone Number Format Using Regular Expression

Write a JavaScript program check phone number format using regular expression.



Source Code
<html>
<head>
    <title>Check for valid phone number format</title>
    <script language="JavaScript">
        function checkNumber() 
        {
            var number = myForm.myField.value
            var check = /^[0-9]+\.?[0-9]+$/;

            if (!check.test(number)) 
            {
                window.alert("You must provide a valid number.");
                return false;
            }
        }
    </script>
</head>
<body>
<form name="myForm">
    Enter a number: <input type="text" name="myField"><br>
    <input type="button" value="Submit" onclick="checkNumber()">
</form>
</body>
</html>
Output