有一组ID 字符串，类似下面这样：

Question

<script language=javascript>
var str="85|101|202|303|808|108|8|998"
alert(str.replace(/\|8\|/g,"\|"))</script>

Answer 1

var str="8|85|101|202|303|808|108|8|998";
alert(str.replace(/(\|8)|(8\|)\|/g,""));

Answer 2

<script language=javascript>
var str="8|85|101|202|303|808|108|8|998|8"
alert(str.replace(/(^|\|)8(\||$)/g,function(a,b,c){return (b=="|"&&c=="|")?"|":""}))</script>

Answer 3

<script type="text/javascript">
/*<![CDATA[*/
 var s="85|101|202|303|808|108|8|998";
 alert(s.replace(/\b8\b/,""));
/*]]*/
</script>

Answer 4

<script type="text/javascript">
/*<![CDATA[*/
 var s="85|101|202|303|808|108|8|998";
 alert(s.replace(/\b8\b/,"").replace(/\|\|/g, ""));
/*]]*/
</script>...........