Question

I’m using C# replace text in a string but failing when the text is at the end of line.

string filepent = filehex.Replace(",,,,,\r\n", ",EMPTY,EMPTY,EMPTY,EMPTY,EMPTY"); 

I am loading a txt file into a filestream and then converting to a string. I want to replace a anywhere where it says “,,,,,” at the end of a line. Currently the code above only changes it at the end of the file. At the end of a line where it should change it my hex editor says there is .. or 0D 0A

Thanks

Answer 1

I’d be tempted to instead split the file using File.ReadAllLines, make the replacement, then join them back together. Maybe not the most performant, but clearly expresses your goal. Something like:

string matchPattern = ",,,,,$"; // $ to match the end of the line.
string replacement = ",EMPTY,EMPTY,EMPTY,EMPTY,EMPTY";
string filepent = String.Join(
    Environment.NewLine, // or maybe just "\r\n"
    File.ReadAllLines(yourFilePath)
        .Select(line => Regex.Replace(line, matchPattern, replacement)));