.net中字符串分割解决办法

.net中字符串分割
string str = "wearaasdad$$$$dasdasdasd$$$dasdasdad a$$$$dasdgfdsgs$dasd$$$$";
有这样一个字符串，如何根据"$$$$"这个字符串分割str？
就是我要获取wearaasdad，dasdasdasd$$$dasdasdad a，dasdgfdsgs$dasd这三个字符串，求各位大虾帮忙！

[解决办法]

C# code

 string str = @"wearaasdad$$$$dasdasdasd$$$dasdasdad a$$$$dasdgfdsgs$dasd$$$$"; string[] xstr=str.Split(new string[] { @"$$$$" }, StringSplitOptions.RemoveEmptyEntries);
[解决办法]
额，看错了，没注意是四个$$$$
2楼正解
[解决办法]
C# code
string str = "wearaasdad$$$$dasdasdasd$$$dasdasdad a$$$$dasdgfdsgs$dasd$$$$";string[] result=Regex.Split(str,@"\$\$\$\$");