Regular Expression for Javascript

整數或小數 /^[0-9]+(\.[0-9]+)?$/
整數5位或小數3位 /^[0-9]{1,5}(\.[0-9]{1,3})?$/
整數 /^[0-9]/

<input type="text" name="name1" value ="123" onblur="checkInput(this,this.value)"></input>
<script language="javascript" type="text/javascript">//Added by Sting -- 2011/10/03
function checkInput(obj,v){
v = v.replace(/\,/g, "");
if(v != "")
{
var pattern = new RegExp(/^[0-9]+(\.[0-9]+)?$/);
if(!pattern.test(v)){
alert("Please enter the number!");
obj.select();
return false;
}}}
</script>