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<html>
<head>
<title>Matching a 16 digit credit card number separated by a single space</title>
<script type="text/javascript" language="javascript">
<!-- //
function IsMatchingCard(str){
var myRegExp = /[0-9]{4} [0-9]{4} [0-9]{4} [0-9]{4}/;
return myRegExp.test(str)
}
function TestGuess(){
alert(IsMatchingCard("1234 1234 1234 1234"));
}
// -->
</script>
</head>
<body>
<h3>This page allows you to enter and check a 16 digit credit card number</h3>
<form>
<button type="Button" onclick="TestGuess()">
Click here to enter card number</button>
</form>
</body>
</html>
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