asp.net - Replace the last occurrence of a word in a string - C#

Question

I have a problem where I need to replace the last occurrence of a word in a string.

Situation: I am given a string which is in this format:

string filePath ="F:/jan11/MFrame/Templates/feb11";

I then replace TnaName like this:

filePath = filePath.Replace(TnaName, ""); // feb11 is TnaName

This works, but I have a problem when TnaName is the same as my folder name. When this happens I end up getting a string like this:

F:/feb11/MFrame/Templates/feb11

Now it has replaced both occurrences of TnaName with feb11. Is there a way that I can replace only the last occurrence of the word in my string?

Note: feb11 is TnaName which comes from another process - that's not a problem.

Answer 1

Here is the function to replace the last occurrence of a string

public static string ReplaceLastOccurrence(string Source, string Find, string Replace)
{
        int place = Source.LastIndexOf(Find);

        if(place == -1)
           return Source;

        string result = Source.Remove(place, Find.Length).Insert(place, Replace);
        return result;
}

• Source is the string on which you want to do the operation.
• Find is the string that you want to replace.
• Replace is the string that you want to replace it with.