<script>
var s="my javascript is very poor,who can help me?"
var reg=/(\w*)my(.*)is(.*)can(.*)/g
alert(s.replace(reg,"$1his$2was$3could$4"));
</script>
参考链接：http://bbs.csdn.net/topics/320097246
原文：http://www.cnblogs.com/lzyit/p/6663789.html