在斜杠之间查找子字符串并在ASP.NET C＃中替换该部分

Question

使用ASP.NET C＃，我需要在最后两个斜杠之间找到并替换单词string1，并用string2替换

示例：

string fullStr = "/this/is/string1/part";
string subStr = "function";
string finalStr = "/this/is/" + subStr + "/part";

Answer 1

正则表达式解决方案：

string fullStr = "this/is/string1/part";
string subStr = "function";

var newstr = Regex.Replace(fullStr, @"/[^/]+/(?=[^/]+$)", m => "/" + subStr + "/");

Answer 2

我觉得这里不需要正则表达式。

string fullStr = "/this/is/string1/part";
string subStr = "function";

string[] fullStrParts = fullStr.Split('/');
fullStrParts[fullStrParts.Length - 2] = subStr;

string finalStr = string.Join("/", fullStrParts);