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<html>
<head>
<title>Whether a string contains only numerical data</title>
<script type="text/javascript">
var numericalString = "3.14159265";
var characterString = "3 point 1";
var pattern = /^-?\d+(\.\d+)?$/;
var a = pattern.test(numericalString);
var b = pattern.test(characterString);
document.write(a + "<BR>" + b);
</script>
</head>
<body>
</body>
</html>
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