在javascript中，怎样取字符串后面的数字？？

Question

var s = "a2343dddd";
var n = s.replace(/[^\d]/g, "");

Answer 1

<script>
var str="dfadsw125";
var re = /.+\D+(\d+)$/;
alert(str.replace(re,"$1"))
</script>

Answer 2

<SCRIPT LANGUAGE="JavaScript">
alert("ad23".match(/\d+$/));
</SCRIPT>

Answer 3

<script>
var str="dfadsw125sdsad";
var re = /\d+/;
alert(re.exec(str)[0])
</script>

Answer 4

var s = "a2343dddd";
var n = s.replace(/\D/g, "");