java采用正则表达式

? <META NAME="Author" CONTENT="">
? <META NAME="Keywords" CONTENT="">
? <META NAME="Description" CONTENT="">
? <script type="text/javascript">
function checkthis()
{
var t=document.forms[0].elements[0];
var reg=? /^(-[1-9]|[1-9]|(0[.])|(-(0[.])))[0-9]{0,}(([.]*\d{1,2})|[0-9]{0,})$/;<input type="button" value="检查" onclick="checkthis();" />
</form> ?? //???????????} ?? // ?? //???} ?? ????????}??