<script language="JavaScript">
<!--
//** power by fason
var re=/[a-zA-Z]([\/-])[a-zA-Z]\1[a-zA-Z]/
var str="y-m-d"
if(str.match(re) !=null)alert(RegExp.$1);
//-->
</script>
<!--
//** power by fason
var re=/[a-zA-Z]([\/-])[a-zA-Z]\1[a-zA-Z]/
var str="y-m-d"
if(str.match(re) !=null)alert(RegExp.$1);
//-->
</script>
用replace("字符串","要替代的符号","替代为什么")