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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="Content-Script-Type" content="text/javascript">
<script type="text/javascript">
var re = /(?:\d{3}|\(\d{3}\))([-\/\.])\d{3}\1\d{4}/;
function testInfo(phoneInput){
var OK = re.exec(phoneInput.value);
if (!OK)
{
window.alert(RegExp.input + " isn't a phone number with area code!");
q.value="";
}
else
window.alert("Thanks, your phone number is " + OK[0]);
}
</script>
</head>
<body>
<p>Enter your phone number (with area code) and then click "Check".
<br>The expected format is like ###-###-####.</p>
<form action="#">
<input id="phone" name="q"><button onclick="testInfo(document.getElementById('phone'));">Check</button>
</form>
</body>
</html>
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