替换字串的正则表达式（即给分）

[伟大de虫子]

有如下三个变量：
str1 = "http://www.abc.com"
str2 = "/test/"

cont = 这里是一大串html代码内容

如何使用正则将cont的内容里以str1开头，str2结尾的内容变为空。
包括str1与str2

要将转换后的结果返回cont

[fason]

<script>
str1 = "http://www.abc.com"
str2 = "/test/"
cont = "ihttp://www.abc.comhehehhehe/test/ am http://www.abc.comhehehhehe/test/fason"
var r = /([\.\:\/\?\*\+\(\)\{\}\[\]])/g
str1 = str1.replace(r, "\\$1");
str2 = str2.replace(r, "\\$1");
var re = new RegExp(str1 + ".*?" + str2, "ig");
cont = cont.replace(re, "");
alert(cont);
</script>

[LxcJie]

<SCRIPT LANGUAGE="JavaScript">
<!--
var str1 = "http://www.abc.com";
var str2 = "/test/";
var con = "http://www.abc.comsdfasdfasdfasdfasdfasdff/test/";
var patternStr = "(" + str1 + ").*(" + str2 + ")";
var pattern = new RegExp(patternStr,"g");
con = con.replace(pattern,"$1$2")
alert(con)
//-->
</SCRIPT>