s = string.gsub("Lua is good", "good", "bad")
print(s) --> Lua is bada = "我们使用$";
b = string.gsub(a, "%$", "RMB");
print(b) --> 我们使用RMBhttp://blog.csdn.net/weiyuefei/article/details/52044235原文：http://www.cnblogs.com/tangyongle/p/7998412.html