用正则表达式判断输入的数字是否合法的例子
$in="2344";
if(ereg("^(-{0,1}|+{0,1})[0-9]+(.{0,1}[0-9]+)$",$in))
echo "Ok!";
else
echo "Sorry,Please input again!";
?>
很简单的嘛！
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