<head>
<title>Untitled</title>
</head>
<body>
<?php
$in="2344";
if(ereg("^(-{0,1}|\+{0,1})[0-9]+(\.{0,1}[0-9]+)$",$in))
echo "Ok!";
else
echo "Sorry,Please input again!";
?>
<br>很简单的嘛！
</body>
</html>
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