In my opinion, I want to remove only '01|CF' out string '01|CFV,01|CFY,01|CF' to '01|CFV,01|CFY'. But have 3 mark '01|CF' in this string, so if replace string, i will take to result 'V,Y,'. I want to know how to solve that

string stringToSearch = "01|CF"; 
string stringToBeSearched = "01|CFV,01|CFY,01|CF";

CodePudding user response：

First 01|CF replace with "" and remain V, Second 01|CF replace with "" and remain Y, And third 01|CF replace with "" and remain nothing Result: V,Y,

CodePudding user response：

In your comments you elaborate further into your problem and notice why it does display that output:

I want to remove only 01|CF' out string 01|CFV,01|CFY,01|CF to 01|CFV,01|CFY. But have 3 01|CF matches in this string, so if I use string.Replace(), I will take to result V,Y,. I want to know how to solve that.

The trick is using a different approach. You need to locate the last match of the 01|CF using string.LastIndexOf() and based on that index/position get the part of the string that you want using string.Substring().

string stringToSearch = "01|CF"; 
string stringToBeSearched = "01|CFV,01|CFY,01|CF";
int lastMatchPosition = stringToBeSearched.LastIndexOf(stringToSearch);
string firstPart = stringToBeSearched.Substring(0, lastMatchPosition - 1);
Console.WriteLine(firstPart);

It outputs:

01|CFV,01|CFY