<!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}\1\d{4}/;
function check(){
var OK = re.exec(f.q.value);
if (!OK)
{window.alert(RegExp.input + " isn't a phone number with area code!");
f.q.value="";
document.f.q.focus();
return false; }
else
window.alert("Thanks, your phone number is " + OK[0]);
}
</script>
</head>
<body>
<p>Enter your phone number .
<br>The expected format is like ###-###-####.</p>
<form name="f" action="#" onsubmit="return check()" method="get">
check:<input type="text" name="q">
<input id="phone" type="submit" value="check">
</form>
</body>
</html>
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